I was working on the Unconnected Notables page today, and I realised that about half of the notables listed on that page are unlinked. That is, they don't have any parents, spouses, or children listed on WikiTree. So, I did a search, and learned that there are 6,215 unlinked notables listed on WikiTree. Granted, that's only a small fraction of the 1,179,809 unlinked profiles on WikiTree, but our "5 star profiles" are more likely to be notables, and any time somebody does a search on an unlinked notable and ends up on WikiTree, they're probably not going to be terribly impressed with our site.
Now, I get it that connecting a profile can be a long and complicated process. It took me ages to connect my branch, and we have notables with up to 217 profiles in their branch who still aren't connected to the main tree. (Actually, there may well be unconnected notables with even more profiles in their branch, because not all unconnected notables on WikiTree have been added to that page yet.) So asking people to connect every unconnected notable in one weekend (or even to try) would be a bit much. However, it seems to me that having a challenge to provide at least one link (parent, spouse, or child) to each unlinked notable on WikiTree could be very doable. (It might even be finished in a single day.)
Of course, if people manage to find more than one link per notable, that would be great. But even if people only manage to find one link per notable, that would still double the chances of finding a connection to the main tree, since there would be two people to find connections for in each branch, rather than one.
(And, if we do manage to provide a link for every unlinked notable, we could have another challenge to move each notable branch with two profiles up to at least three profiles, and so on. The ultimate goal, of course, is to connect them all to the main tree, but breaking that task up into bite sized chunks should make it much less intimidating, and therefore more people should be likely to take part in it, so it gets done faster.)