Why do my emails and calendar events start with ??

Bookings start with double question marks (??) on your calendar, in your confirmation emails, or on your Bookings dashboard when you have Tentative Bookings enabled on a booking page. 

The question marks indicate a booking has not yet been confirmed. Once you accept the booking, the question marks will be removed from your calendar event, and from any future emails to yourself and the booker.

To have bookings go straight into your calendar without the need to confirm them, turn off Tentative Bookings under Notifications > Actions > After new booking made.