You are a very lovely friend to want to do this for your buddy!!! It will be ALRIGHT!! I do not know why people do this when you are just trying to do something nice for someone. But it does seem to happen that they tend to go the other way instead of doing all they can to help and work together with you! That being said-if you can afford to do it, go on and do the mexican food. What you could do is a taco buffet-and use those foil pans with the burners from Party city to keep the meat warm. You could shop around for the best deal on ground beef, and let me tell you, you can buy mostly the inexpensive chop and mix it with the leaner, more expensive chop, and it will work great, and go a long way. If you have chili powder, onion powder, garlic powder, salt, pepper, some chopped onions, bell pepper, salsa, you just brown the meat, drain it, and season it with those items to taste, and you are good to go. With all of the components for this you could have quite the impressive display: chopped avocados, tomatoes, lettuce, cheeses ( cheddar and maybe even mozzarella), cilantro, sour cream, taco shells.Some of the cheaper salsas are good enough, and again you could mix some Kroger store brand with some Pace in a large pretty glass dish, and it will taste delicious. Use pretty serving dishes from home, and lay it all out using a mexican throw as your table cover. Place books or boxes under the throw and display the foods at different levels. Add some matching votive candles and silk flowers throughout the food maybe, in some stemmed goblets. If your girls go on and help I think you can pull this off in such a way that will impress your friend and not put a huge crunch on your pocket book! I would serve a little wine if it would please the guest of honor, but if not, then I would stick to my guns on the cheaper punch, unless the friend who is insisting wants to buy the wine. Cake and wine would be ok, but if you are able to include the food, that would be even better. Tacos are not too expensive, and they go a long way. You could even add some soft tacos ( prepare them at home, then keep them warm in your foil warming pans,too). This will give your guests more variety. If it were me, I would make up a huge batch of spanish rice at home (or have someone do it if you do not know how to make it) then keep that warm in a foil pan,too. My strategy here is spanish rice is really cheap, adds something really good, and will help stretch your meal in a good way! Use balloons, ditch the present since you are doing such a lovely meal, add some great music-and the party is on! Your friend will love it!!!! Write me back if I can offer any more! Wish I was able to come help you-I love doing events!!! God bless you!!!