Do you have any slower night that you would like to boost? The perfect option is to introduce Music Bingo on a busyer night and get the crowd to love it, and then move to a slower night.
Do you have busy sport nights where people leave home after the game? How much extra value would your customers create if they stayed in your pub for 2 extra hours after a football match?
How valueble would you describe a loyal customer? Loyal customers bring in more money that random customers, and they promote your venue to their friends.