Is it possible to pass UTM parameters?
YouCanBook.me can handle UTM parameters.
However, in order for UTMs to be tracked in Google Analytics, you must pass them through after the booking to a page with Google Analytics code embedded.
To do this, use the Redirect to a specific URL after a booking. feature.
(Redirecting to a page after the booking is required as YouCanBook.me pages to not support Google Analytics tracking code).