Her retirement is official and apparently it was a pretty nice sized event...
AV actresses bid farewell to Ai Uehara at Asakusa strip theater
Yui Hatano and Mana Sakura said goodbye to Uehara who told her fans: 'Don't you forget about me'
The theme is that they are drunk chicks from in and around the area of a beer festival. Thus why there are shots of the large beer lists outside the restaurants/bars at the beginning.