I must admit I have never been there. I have also never seen any adverts for events taking place there (other than this New Year's Eve party). Are there listings somewhere we could put up here?
I just had a quick search and found the Rivoli's own website, which has basic details on their upcoming events plus some links to those who host regular and themed nights. Not sure whether I can post the link under forum rules, but it is easily googleable (that's a technical term you know).