You really do not need a caterer. With the proper planning, you can do this yourself and have a little money left over. You can call stores like Sam's, HEB, or Central Market to see what they have available as far as finger foods ( it's a yes on the finger foods straight from their deli) and delivery. You can rent a margarita machine and go to Arne's for your party decor. Ask anyone about Arne's and they will tell ya it's the one stop shop for every occasion. Get some festive Tiki Torches to light the walkway or the atmosphere outside. Some white 'holiday' lights....a little thought could save you some serious dough as all teachers and working mothers know every little bit counts! Best of Luck to ya!