Limit the number to 10. Only 10 people allowed. If there are more than 10 people, they can still go for a crawl, but it is going to have to be crawl number two.
Do it in Chinatown. That is a central location. People from all over the city can hope to participate. If it is going to be more than one group on the same day, coordinate such that no one restaurant is visited twice by all groups combined.
