Obviously there would be the option of turning the email notification on and off, just like there is now for new registrations.
What kind of board are you running with people posting events non-stop? Allowing everyone to post events without approval would mean a HUGE calendar and if you had to post each event yourself you'd be making entries to the calendar all day.
Approval would keep out the garbage posts and save a lot of time. You wouldn't have to individually give authorization to post, you'd keep garbage entries off the calendar, and you wouldn't have to make the entries yourself (just approve the ones coming in).
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