I ran an adventure with 30+ people at my local area convention I-con. I got the characters together by having them all traveling on a double decker bus. It seems a radioactive waste spill dumped some nasty green waste which was bolth highly radioctive & toxic as well as able to spread the love by merely touching people. It was very interesting when the people on the buss accidently shot the bus driver in the head when they first saw the zombies. A Hair dresser character trying to drive the bus drove it deeper into the toxic waste.

It was a great adventure.