Czech Beer Festival in Prague started last week and will be going on until the 28th of May. This year they offer 120 different beers on tap, from different Czech Breweries. The beer tolars cost 44 Czk each (1 tolar = 1 beer). For the empty (or full) stomach there are a couple of menus to choose from, which offers traditional Czech cuisine.
Awesome breweries like Kocour, Purkmistr, and Svijany are all attending this festival, so there are no excuses to not check it out at least one of the days.
To get to the festival area, get on the red metro line (C) in the direction of Letnany, which is also the stop where you get off at. The festival area is only a couple of hundred meters away from Letnany metro station.