We don't have synonyms for bank night yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are back light and bad night.
(n) :
(idiomatic) An event where patrons are enticed to buy entry tickets into some venue, for example a movie theater, with the anticipation that they will be entered into a drawing to win an amount of money if their ticket is drawn and they are on-site at the time of the winning.
(n) :
(idiomatic) An event where patrons are enticed to buy entry tickets into some venue, for example a movie theater, with the anticipation that they will be entered into a drawing to win an amount of money if their ticket is drawn and they are on-site at the time of the winning.