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You mean this? It's somewhere as a topic on this forum:
Issue: Calendar not allowing to set events.
Answer: Go into modules/calendar/calendarUI.php
On line 298 (or close by) change the line
from: $this->_template->assign('allowEventReminders', $allowEventReminders);
to: $this->_template->assign('allowEventReminders', true);
That fixes the issue with not being able to set reminders. (its a work around until I can find where the variable is in the db and set it there!)