Calendly is cool but needs some attention!
Login to www.calendly.com and connect your calendar
Make sure you get the right time zone
Ask the right questions
Offer plenty of options
Make sure you offer enought interesting slots
Lead time - and time after the meeting
Decide how much in advance meetings can be booked
Block time after the meeting (to process and recuparate your batteries)
The slots won't show up in your calendar!
What messages do users get? Is the language correct?
What links do you provide e.g. for the guestlist linking to the lobby?
If more than one person can take slots use the Round Robin role.