Trying not to give my hopes up...
But there's really no rational explanation for Kevin Love to be in Boston right now other than it having something to do with him potentially getting traded here. He's been to Boston before... several times with the Timberwolves. WHy would he randomly decide to "check out Boston" for a weekend in the midst of his Summer vacation. Dude should be chilling in the Virgin Islands or something... not hanging out in Boston.
This is clearly tied to Boston's attempts to trade for him. I still don't think it's 100% certain to happen, because I think other teams may step in with better offers... but this is absolutely related to the Celtics.