This festival sure has good food. If you are at a party, then ask if they know the host. There are a lot of good sales going on. This place always has a good food or items. Sometimes this is the best approach.
Most people appreciate honesty.
Once you given the opening line, you need to keep the conversation going. Try looking around, for a subject to talk about. If you are at a concert or festival then continue talking about what is going on there. If you are at a party, then you can talk about the people there or how you met them. Ask what type of work they do.