Is It Rude to Not Offer Vegetarian Food at Your Event?

I am an RA throwing a bingo night at my college.

We have a budget for 40 sandwiches.

I ordered 20 turkey, and the other 20 roast beef.

My co-RA is mad and thinks we should offer a vegetarian option, and that no one will eat roast beef and I should have ordered ham. What do you think?
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