Our form: https://www.zeffy.com/en-US/ticketing/the-hubbub
Why it worked: Our goal was to host an accessible event that felt welcoming to all socio-economic levels. We were able to sell both main event and after party tickets with a variety of discount codes for different stakeholders, and offer "pay what you can" tickets for the after party.
One thing another nonprofit could repeat: "Pay what you can" tickets can't be sold at the door, but we created a separate campaign for after party door sales with a low ticket price that guests could add an additional donation on top of if they were able to and inclined to pay more.