sell low price vouchers, require ID for them, make them refundable in 90+ days or in person with ID only set up a membership/trust/reputation system for fans a

sell low price vouchers, require ID for them, make them refundable in 90+ days or in person with ID only set up a membership/trust/reputation system for fans and/or frequent venue goers (eg. locals), and if they actually show up to gigs, then you can reduce the refund wait time for them, etc.