Prices depend on the event.
Varies according to what's on. See the website. Generally open from 11.30pm-6am.
Le Bar à Bulles, renovated in 2015, hosts various free events - private viewings, exhibitions, etc - and serves brunch at the weekend. It is open Wesdnesday to Sunday, from noon http://www.lamachinedumoulinrouge.com/le-bar-a-bulles