flag an interest on an activity
I would like to see a feature in the website to let me flag to myself that I am interested in signing up for an activity, that I can return to with a filter and decide whether to sign up or let it slip. Personally, I would not care if my interest flags were visible to others.
Gabrielle Orsi commented
I like this idea. Sort of like ebay.com's "watch list", where you mark items that you are considering?