Dream Party, the bi-annual event devoted to beautiful girl games, was held in Tokyo over the weekend. Cosplayers were in attendance, too.
According to website Heisei Democracy, the point of Dream Party is for bishoujo companies to raise money through schwag for sale or to build hype for their games.
【コスプレ速報】魔法少女まどか☆マギカ多し！「DreamParty東京2011春」コスプレ ダイジェスト [moeyo.com]