Hello cotters.. would like to ask for some suggestions. I'm arranging a suprise bday celebration for one of my friends this coming week. I've arranged her different group of friends to come over together for dinner and surprise her. But im worried that coz its different group, people might find it bored and just sit around.. any suggestions on what i can do to make it more lively and fun?

I've arranged for the dinner to be at marche. Appreciate all suggestions.