Wiktionary
n. (context idiomatic English) 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.
Wikipedia
Bank Night was a popular fad lottery game franchise in the United States during the Great Depression. It was invented and marketed by Charles U. Yaeger, a former booking agent for 20th Century Fox.
In 1936, Bank Night was played at 5,000 of America's 15,000 active theaters, and copies of it were played at countless more. The popularity of Bank Night and similar schemes contributed to the resiliency of the film industry during the Great Depression more than any other single business tactic.
Usage examples of "bank night".
But I also have my big premium offer-bank night, bingo, whatever you wish to call it.