If I enter an event and choose the "mail -in payment" is it possible to return to that entry and pay it by credit card at a later date if you so desire?
Do not believe you can do so online. IF Rick is the secretary for the show, you can call Event Entries and they will take the credit card over the telephone.
Ditto - don't think you can do it online, but Rick is great about making changes, etc. Give him a call or shoot an email his way.