Would you be able to add a template field for the event organiser's email address to the Asset Booked Contact Template that is sent to the asset administrator?
This would allow us to create an email filter to send an automated response back to the organiser, regardless of whether the asset is approved or not:
e.g. %event_organizer_email% = The email address of the event organizer
A new booking has been made for the asset "DVD Player".
Event Name: Test
Event Organizer: Smith, John (firstname.lastname@example.org)
Booking Date(s): Today 1:00 PM - 2:00 PM
The booking has been made and no action is required on your part. You can view the event online at https://...
At this stage this isn't possible, but I'll add a feature request to this for you.
Hope this helps,