Many trivia nights are now”bring your own food and drink”. Make it more attractive for people to attend with the option of pre-ordering and paying for food. Provide low risk catering with minimum wastage. There is always someone who has their “specialty” dish they could whip up.
With pre-ordering you could also make arrangements with a cafe or delicatessen to supply the orders at reduced cost in exchange for some online publicity.
The menu of items available could be displayed on the website