So do what dishes is not a problem, the flavor is the problem, you have a grasp of which kind of dish is more critical.
Often catering site is in a concentrated flow of people, commercial areas or office areas of greater demand, in addition to the three main dishes you pick is biased in favor of affordable dishes, office workers are more likely to go to the choice. But because it is a civilianized dish, so the residential area is less suitable. As for school districts it depends on the local situation, after all, the school is likely to have a cafeteria.
Longfang is not too familiar, but there are university towns, if the flavor is sure you can go inside the boob, in addition to PICC and several other office buildings concentrated area can also be considered. Or go the take-out route