Museum Night tonight (10 June 2017)

then you can run down the road for a similar event in Budapest https://www.budapestbylocals.com/event/night-of-museums-budapest/

James, It looks like we miss that by a hair -- we fly out from Budapest the morning of the 24th. Thanks for the info, though.

Maybe the Czech beer festival then? http://www.csehsornapok.hu/
Or the Danube Carnival http://dunakarneval.hu/en/
Or the Budapest Summer Festival http://eng.szabadter.hu/
Or end the trip with a little Gypsy Jazz http://bmc.hu/#!/program/4260/Szakcsi_Trio
Or an odd coincidence since Hajdu Klára is playing in the background right now: https://www.bjc.hu/programs/artist/hajdu-klara-quartet-feat-szakonyi-milan/