Tax
| most exhibitors will be professionals, so the aspect should be covered. check if you need to take further action.
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Insurance
| yepp, but the church should have that covered - verify.
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Music
| I don't know your american rules, but in Germany you'll have to pay some fee when music is played in a event. Inspectors are aware of this - so should you.
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Helpers
| you'll need some help throughout the event and in planning. so get some folks that help you.
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Additional costs
| verify what needs to be payed to the church or other organisations around your event (e.g. for electric power). Make sure you've got enough money in the budget.
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Drinking & Eating
| needs to be covered too for visitors and exhibitors(!) & crew(!). May be the church members will help you on that (earning some money for their projects due to the sale?)
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Competition
| Think if you want to make up some competition for the exhibitors. Ask the companies for gifts - they have plenty of them (might be good to have a shop owner with good contacts to manufacturers).
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