Do I need to be single to join a Thursday Trip?
No, you do not strictly need to be single to join a Thursday Trip, although the trips are designed mainly with singles in mind and the large majority of people who come are single. What matters most is coming with an open, social, and respectful attitude.
If your relationship status changes between booking and the trip, that is completely fine and you are still welcome. Thursday Trips are about friendships, shared adventures, and lasting memories as much as dating.