Salads, burgers, pastas, soups, tacos, chili and stir fries are all probably safe bets .. ie. nothing too far out of most people's comfort zone. Myself - I probably would never try 'selling' the fake meats, tofu or seitan to someone who has not tried and liked it already.
Outside of that list, a few recipes that I tried and would feel comfortable serving non-vegan friends include: Quinoa and Black BeansTomato Butternut Squash SoupButternut Squash and Pear SoupQuinoa and Herb Stuffed Acorn SquashButternut Squash and Black Bean EnchiladasBroccoli RisottoQuinoa Salad with Pears, Baby Spinach and Chickpeas
I served a few of these to my parents (non-vegans) and they seemed to like them.
Yes, I really like squash! It is actually new to me since becoming vegan and I can't seem to get enough of it. lol.
Today I was at a birthday party and they had veggie samosas (for me!) ... if I knew how to make those I'd totally be okay serving them. Yum.
Mostly I recommend that anything you are going to serve to guests you've tried at least once yourself.