What kind of liability insurance is needed for a business that provides staff to sell tickets at outdoor festivals; the staff would all be subcontractors?
Contact a good agent in your area, they will be able to help you with this.
Childcare staff numbers - how many children per staff member?
Since these are not day care centers or schools they are usually pretty unregulated, although the corporate offices may have rules. I'd check with your local Dept. of Health to make sure.
Should I say 'the staff were' or 'the staff was'?
The staff was is correct