Reg On Selling Tickets for Raffle at Bank

I am hosting a medical benefit for a friends little boy. We both are employees of a bank in central Illinois. For the event I would like to have a 50/50 and gun raffle with tickets available for purchase from the branches of our bank. Could you answer whether or not that is acceptable or point me in the direction of what Reg. I need to look into to get my answer. They bank would not be sponsoring the drawings just hosting sign up.