1-Offer to bring a couple of dishes
2- Try not to focus on the food too much and focus more on the company
3- Be prepared to answer questions on why you are a vegan.
4- Offer to help in the kitchen, as not everyone knows how to handle vegan food
5- Make some kind of food type gift (maybe cookies wrapped nicely) that people can take home and enjoy
6- Accept that not everyone understands veganism
7- Fruit is a nice accompaniment to the meal or for snacks as most people eat fruit and its vegan.
8- Ask nicely what is on the menu and how its cooked if you can
9- FACT – Unless you have prepared it your self you can never be 100% sure it truly is vegan
10- Be the kind of vegan you want to see