Hi, Davide,
1), please go to Host >> Schedule, how many schedule for "Hyper.Modules.EventsCalendar.SendReminder, EventsCalendar" are there?
If you have more than one, delete one of them.
2), currently it does not support deletion from Edit page, all deletion are done at the Detail page. (we may add this feature)
3), the reminder date time is formatted using the portal default Locale, it will not be following the user specific locale which may be different from portal locale.
Hope that helps?
