Well... I don't speak japanese... but I found the blog of this show or something like that:
http://ameblo.jp/erykah-madonna/
You can read in the show description:
"ワインHOSTESS
DAINAGON
（↑from 浜崎あゆみナイト～A museum～）"
I searched by "DAINAGON" on youtube and found more drag videos, with the term "drag queen" in the description, like this one:
http://www.youtube.com/watch?v=5-hMSF8gzwo
=)
By the way, it really looks like a drag show at a gay bar