Tools like Doodle are well used. I think that a Doodle like application for Communities can be very helpful. Its possible to build this as a survey, but its not for a normal user. I suggest an easy application / widget for Communities.
Importent are following points (my point of view)
- Allow multiple requests (like multiple Activities, Ideation Blogs)
- Easy selection of "open for all members" or "select members"
- Templates like:
- date and time frame per hours
- date frame and choice only antemeridian or post meridiem
- every weekday and time frame per hours
- every weekday and choice only antemeridian or post meridiem
- "Create an ics-File" or "Export to Calendar" function