We're planning to do hors d'oeuvres and sweets along with the cake. I'll be doing a lot of baking, and we'll be ordering vegetable, cheese, and fruit trays and providing some other light snacks. We have quite a few people with dietary restrictions (vegan, gluten free, food allergies), and we want to make sure everyone has something that they can eat. To that end, would it be tacky to invite guests to bring their favorite appetizer?