Translated articles from The Huffington Post and Le Parisien.
The Huffington Post : PHOTOS. VIDEO. Psy's Gangnam Style : a giant flashmob gather 20.000 persons at Trocadéo in Paris.
FLASHMOB - The last time the Trocadero place was filled that much, it was for the final campaign rally of presidential candidate Sarkozy in spring 2012. Monday, November 5, it is for a 34 year-old Korean that thousands of people gathered in the sixteenth arrondissement of Paris.
Thanks to the school holidays, about 20,000 people (according to several participants on Twitter), were present at the call of the radio host Cauet on NRJ and danced in the early afternoon on the tube from PSY, whose clip Gangnam style has been viewed more than 650 million times on YouTube.
(More pictures from twitter on the article)
Le Parisien : 20 000 people gathering for a giant "Gangnam Style" at Trocadéro.
Marie Poussel & Aurélie Rossignol | 05.11.2012, 14h02 | Update : 16h47

Successful operation for radio host Cauet and PSY, the inventor of "Gangnam Style" dance, from South-Korea : more than 20 000 persons attended the flashmob on Trocadéro square in Paris. (AFP/FRANCK FIFE)
The "Gangnam Style" wave won Paris over. A flashmob organized by the radio host Cauet in Trocadéro (Paris) was attended by nearly 20,000 persons on Monday. A human tide, up to the global phenomenon that has even surprised the organizers of the event. Korean singer PSY conquered the planet since his video was posted on YouTube last July.
The video is closed to win a incredible title : most viewed video of all time on youtube. A record held previously by Justin Bieber with his "Baby" with some 796 million views. For nearly two monts, Cauet and his band from NRJ radio worked on a flashmob that took place under the Eiffel Tower. They even established a ritual beginning of each show with "la dance du cheval" (aka "the horse dance"), the French version of the comedy and choreography from "Gangnam Style". The cover was filmed and the video already hitted milion views on youtube. But they only knew the meeting place last Wednesday (= they were sure only last Wednesday about where the flashmob would take place). "At first we were very afraid that this does not gather enough people," explains Julie Tomassin, producer and host of the program. "But we honestly did not think that so much people would come. It was incredible." In the early afternoon, fans were already waiting fro PSY in front of the radio station. PSY is invited to Cauet's show tonight, starting at 21 pm.

Photo Twitter via Instagram de @tomjoubert
On Twitter, several users relate the impressive crownd which quickly invaded the square.&

Photo Twitter D_Royse

Photo Twitter Florian Gazan
VIDEO : Amateurs filming event. (see previous video, also posted on Huffington Post's article)
For all the "horse dance" fans wanting to perfect the choreography before going at the foot of the Eiffel Tower, the organizers released a video with the steps to follow, in order to train at home :
At the origins of this strange dance, PSY's video parody the lifestyle of Koreans from the chic Gangnam neighbourhood, in Seoul. Since then, the entire world mimic the choreography's steps.
SOURCES :
The Huffington Post : PHOTOS. VIDEOS. Gangnam Style de Psy : un flashmob géant réuni 20.000 personnes au Trocadéro à Paris.
Le Parisian : 20 000 personnes pour un "Gangnam Style" géant au Trocadéro.
First youtube video (fancam) : Flashmob GEANT Gangnam Style à Paris au Trocadéro avec Cauet et PSY ! par Mrloshy (video embedded on both Le Parisian's and Huffington Post's articles).
Second youtube video : Leçons pour le flashmob de la danse du cheval par Chris Marques - C'Cauter sur NRJ par CauetOfficiel (video embedded on Le Parisian's article ; CauetOfficiel is the official youtube channel from the radio host Cauet).
TRANSLATION
gathyou
OKAY I finnally got that LJ cut.
I made the translation, it was a bit difficult (I apologize for the mistakes), I'm really trying my best.
Some friends from me went there. it has been organized by some French radio host and planed for a long time already, but it turned absolutely crazy!
The Huffington Post : PHOTOS. VIDEO. Psy's Gangnam Style : a giant flashmob gather 20.000 persons at Trocadéo in Paris.
FLASHMOB - The last time the Trocadero place was filled that much, it was for the final campaign rally of presidential candidate Sarkozy in spring 2012. Monday, November 5, it is for a 34 year-old Korean that thousands of people gathered in the sixteenth arrondissement of Paris.
Thanks to the school holidays, about 20,000 people (according to several participants on Twitter), were present at the call of the radio host Cauet on NRJ and danced in the early afternoon on the tube from PSY, whose clip Gangnam style has been viewed more than 650 million times on YouTube.
(More pictures from twitter on the article)
Le Parisien : 20 000 people gathering for a giant "Gangnam Style" at Trocadéro.
Marie Poussel & Aurélie Rossignol | 05.11.2012, 14h02 | Update : 16h47

Successful operation for radio host Cauet and PSY, the inventor of "Gangnam Style" dance, from South-Korea : more than 20 000 persons attended the flashmob on Trocadéro square in Paris. (AFP/FRANCK FIFE)
The "Gangnam Style" wave won Paris over. A flashmob organized by the radio host Cauet in Trocadéro (Paris) was attended by nearly 20,000 persons on Monday. A human tide, up to the global phenomenon that has even surprised the organizers of the event. Korean singer PSY conquered the planet since his video was posted on YouTube last July.
The video is closed to win a incredible title : most viewed video of all time on youtube. A record held previously by Justin Bieber with his "Baby" with some 796 million views. For nearly two monts, Cauet and his band from NRJ radio worked on a flashmob that took place under the Eiffel Tower. They even established a ritual beginning of each show with "la dance du cheval" (aka "the horse dance"), the French version of the comedy and choreography from "Gangnam Style". The cover was filmed and the video already hitted milion views on youtube. But they only knew the meeting place last Wednesday (= they were sure only last Wednesday about where the flashmob would take place). "At first we were very afraid that this does not gather enough people," explains Julie Tomassin, producer and host of the program. "But we honestly did not think that so much people would come. It was incredible." In the early afternoon, fans were already waiting fro PSY in front of the radio station. PSY is invited to Cauet's show tonight, starting at 21 pm.

Photo Twitter via Instagram de @tomjoubert
On Twitter, several users relate the impressive crownd which quickly invaded the square.&

Photo Twitter D_Royse

Photo Twitter Florian Gazan
VIDEO : Amateurs filming event. (see previous video, also posted on Huffington Post's article)
For all the "horse dance" fans wanting to perfect the choreography before going at the foot of the Eiffel Tower, the organizers released a video with the steps to follow, in order to train at home :
At the origins of this strange dance, PSY's video parody the lifestyle of Koreans from the chic Gangnam neighbourhood, in Seoul. Since then, the entire world mimic the choreography's steps.
SOURCES :
The Huffington Post : PHOTOS. VIDEOS. Gangnam Style de Psy : un flashmob géant réuni 20.000 personnes au Trocadéro à Paris.
Le Parisian : 20 000 personnes pour un "Gangnam Style" géant au Trocadéro.
First youtube video (fancam) : Flashmob GEANT Gangnam Style à Paris au Trocadéro avec Cauet et PSY ! par Mrloshy (video embedded on both Le Parisian's and Huffington Post's articles).
Second youtube video : Leçons pour le flashmob de la danse du cheval par Chris Marques - C'Cauter sur NRJ par CauetOfficiel (video embedded on Le Parisian's article ; CauetOfficiel is the official youtube channel from the radio host Cauet).
TRANSLATION
OKAY I finnally got that LJ cut.
I made the translation, it was a bit difficult (I apologize for the mistakes), I'm really trying my best.
Some friends from me went there. it has been organized by some French radio host and planed for a long time already, but it turned absolutely crazy!
no subject
Date: 2012-11-05 11:08 pm (UTC)no subject
Date: 2012-11-05 11:21 pm (UTC)(no subject)
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Date: 2012-11-05 11:19 pm (UTC)And what a nice douchebags assembly with da douchelord Cauet.
Also OP I would translate Danse du cheval in Horse dance. Edit: ok I didn't read it entirely and the dancing horse thing is only at the end.
no subject
Date: 2012-11-06 12:16 am (UTC)I also hate Cauet. But the flashmob wasn't supposed to be that big, and it turned out like this (you're right, it's not a flashmob anymore, but everyone was so surprised). So many people dancing on Gangnam Style... I still have troubles believing it lol
(no subject)
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Date: 2012-11-05 11:24 pm (UTC)no subject
Date: 2012-11-05 11:26 pm (UTC)Thanks for translating, OP :)
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Date: 2012-11-06 12:17 am (UTC)What I don't understand, is why so many people came there !
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Date: 2012-11-05 11:26 pm (UTC)no subject
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Date: 2012-11-06 12:27 am (UTC)no subject
Date: 2012-11-06 01:04 am (UTC)Bien sûr que Nagui devait le faire. Bien sûr.
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Date: 2012-11-06 12:48 am (UTC)no subject
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Date: 2012-11-06 03:19 am (UTC)and u french ppl in this post r so cute omg
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Date: 2012-11-06 04:03 am (UTC)and I was definitely creeping on all the french conversations to test just how much french I have actually learned.
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Date: 2012-11-06 07:10 am (UTC)no subject
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Date: 2012-11-06 09:35 am (UTC)I was just below him when he made Gangnam Style the second time o/
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Date: 2012-11-06 11:17 am (UTC)So you were there ! How was it, from your point of view ? I heard there were tons of annoying people, especially the Cauet crew, but that it was actually pretty exciting to be part of :)
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From:All of that needed to be said tbh
Date: 2012-11-06 11:21 am (UTC)long and in french
Re: All of that needed to be said tbh
Date: 2012-11-06 11:29 am (UTC)Je ne peux pas vraiment juger si c'était vraiment comme ce qu'elle a commenté, mais je pense qu'elle a raison sur le côté flashmob.
Re: All of that needed to be said tbh
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Date: 2012-11-06 11:25 am (UTC)no subject
Date: 2012-11-06 11:27 am (UTC)The first one is pretty impressive, I have to admitt
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Date: 2012-11-06 11:26 am (UTC)Le Point saying that "several millions" were at Trocadéro yesterday (I doubt their counting but well...) http://www.lepoint.fr/culture/plusieurs-milliers-de-personnes-au-trocadero-pour-un-flashmob-avec-psy-05-11-2012-1525030_3.php
Le Nouvel Obs says almost the same thing as Huffington Post : http://tempsreel.nouvelobs.com/video/20121105.OBS8087/video-le-gigantesque-flashmob-de-psy-a-paris.html
Libération : http://next.liberation.fr/musique/2012/11/05/20-000-personnes-a-paris-pour-danser-le-gangnam-style_858216
And TF1 also made a video about that event, I need to find it !
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Date: 2012-11-06 11:33 am (UTC)(no subject)
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Date: 2012-11-06 12:45 pm (UTC)no subject
Date: 2012-11-06 12:50 pm (UTC)Effectivement, je n'avais pas remarqué... Moi aussi, j'ai toujours utilisée "une" flashmob, je ne comprends pas plus que toi !
(no subject)
From:no subject
Date: 2012-11-06 01:49 pm (UTC)no subject
Date: 2012-11-06 04:07 pm (UTC)I translated it so everyone could join but the comment started bashing on Cauet and then, out of control x)
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Date: 2012-11-07 05:39 am (UTC)