Once you've started capturing UTM parameters on your booking page, you can access them in several ways.
Download Bookings (.CSV)
There are several places in your dashboard where you can download a spreadsheet of your bookings. Inside the spreadsheet are UTM parameters for each booking.
Check this guide for passing your UTM parameters through to your thank you page.
All UTM parameters are sent to Zapier so that they can be handed off to your other Meeting Types.
All UTM parameters are available in the webhook data for the booking events. You'll find them on the booking object struct.