Nihonshu (popularly known as saké outside Japan) has been enjoying something of a revival recently.
This event, now in its 4th year, takes place along the pedestrian only Kanamono Dori near the South exit of JR Kanda Station (the venue has switched from Kanda Myojin Shrine).
Tickets last year were 1,000yen if you bought them in advance and 1,200yen on the day. The tickets will likely be limited so it may sell out. Tickets are available at all the stores that will have stalls at the festival as well as many other grog shops around town.