I need help >.<

I'm going to an Anime convention next weekend... and I have to make Bento lunches for 6-8 people. How would i go about doing this? If I make 6 different kinds of bentos... my shopping list ends up huge >.< A friend suggested that I make them all the same thing. Or, make it like a pic-nick and have one container with the main course (probably chicken of some kind), and 2 or 3 smaller containers with other options like the 'egg buddies', octopus weenies and things like that... and of course Onigiri :3 What are your suggestions?? Yoroshiku onegai shimasu. (Thank you in advance)