Hi! I believe that this is a homework to exercise your writing ( and public speech) skills, so I probably shouldn't do it for you, but here are some hints and ideas you can use if you're stuck:
- you can talk about the different occasions when a family or a group of friends got together to eat; maybe you can give a personal example? A specific holiday?
- you can talk about on one hand the big celebretions which unite the bigger family: maybe you only see your uncles for Thanksgiving? and on the other hand the closer family, when they eat together, also gets closer to each other by spending time together.
Hope it helped, let me know how you're doing with the exercise:)