One email is sent in the quarter prior to the scheduled conference date, and the second within 45 days of the event. (gamft.org)
Once payment is made, the adoption contract is completed, and the adoption confirmation email is sent, the new owners will coordinate with the foster to pick up their new pet! (secondhandhounds.org)
If sending more than one email is feasible, you can also consider a tiered approach, where a series of automated emails are sent at different time intervals following an abandonment episode. (blog.hubspot.com)