Inside the Széchenyi Baths, Sparty (see what they did there?) organises a variety of weekly club nights combining drinking, a light show, house and funk DJs, VJs, acrobatics and bathing with a very up-for-it and under-dressed crowd. Don't forget your goggles. Price depends on entry time and what is included (locker or cabin, drinks, towel etc).
Sparty
Budapest