If you will be using electricity for your event, you need to obtain an Electrical permit (PDF). Electrical permits are required for the temporary use of generators, or power cabling from existing structures, to operate lighting or equipment used in conjunction with the tent(s) per Article 80.1, Item 5, of the 2008 National Electrical Code.
Department of Economic Development and Planning
316 N Capitol Avenue
Lansing, MI 48933
Contact the office first before starting to obtain a permit to explain the specific electrical requirements for your event. A licensed electrical contractor will have to obtain the permit and they should contact the electrical division for what is needed. This can vary based on the size (KVA Rating) and number of generators proposed or temporary service hookups etc.