I've added a link in the calendar. It's not commercial.
I played in one of Puzzler's previous treasure hunts. Last time I think we had 5 mandatory pubs, plus 3 bonus pubs if you have time. In a serious statement of intent, my team started in a bonus pub last time
(You have to reach the final stop before time runs out or you're disqualified).
It's an honour system that you have a drink in each, but you need to visit at least the main 5 to find the name of the final stop.