In Ticket Setup, create ticket groups: Early bird tickets and Late tickets.
Then create early bird and late payment ticket types for each ticket with their respective sale start and end dates.
For example, if early bird ticket is available until August 10 and then from August 11th, "late ticket" applies, set the early bird's end date to August 10 and Late ticket's start date to August 11th.
So the ticket would display until August 10 and stop displaying after that. Then from August 11th, it would display the late ticket for sale.
