bostoneventguide Hello
JA Events II template is ready for Joomla 5, however, when we updated this template to J5, Event Booking component was not ready for J5 yet so our team updated template only without Events Booking.
If your site is running with Joomla 4 now, you can use JA Events II template with Events Booking.
In case that you want to use with this template + Events Booking in J5, I recommend you to clone your live site to a dev site and test there first. If everything goes fine, you can update the same for your live site.
Regards