Suggest registration time at event creation

One-sentence description

I would like to show event organisers to not open registration at 13:37 but at 12:30.

Motivation

Event organisers often open registrations at 13:37, but this is a time when many people have lectures, so a suggestion text at this field would help with that.

Desired functionality

Help text at registration opening time.

Suggested implementation

Have a help text at event creation registration time that reads "Prefer opening times at which people don't have lectures, so 12:30 instead of 13:37"