This was a bug but it's been fixed in release 1.0.36 and 1.1.15, see:
https://totara.community/mod/forum/discuss.php?d=17038#p6468
Simon
Best practice forum (Archived)
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Re: Adding a new event date
This was a bug but it's been fixed in release 1.0.36 and 1.1.15, see:
https://totara.community/mod/forum/discuss.php?d=17038#p6468
Simon