The Q: I have a few vegan friends. I have provided an entree option for them, but is it necessary to buy a whole other cake?
The A: No, personally, not to be insensitive, but I think most of the time, unless you yourself are vegan, vegans and veggies are happy that they have something to eat at things like this. An Appetizer and an Entree are already such a welcome surprise, I don't think you need to have an entirely separate cake. It would be a nice gesture to have maybe a tray of vegan cookies to put out or work out another dessert options a fruit tart or sorbets. If it's possible, that's a thought, but a second cake wouldn't be expected by any of your guests.