Fixes some issues in the upgrade event registrations script by correctly deleting the old type event registrants and not assuming the product/event registration still exists...we may still need some code to correct a 'bad' or 'flawed' upgrade with previous script
Changes logic on displaying event registrations based on cutoff date for non-admins, but now the end date for admins...meaning if the event has still not ended, you can still see it without having to go to 'past events'