Spring Weeks for American Students?

I've been hearing a lot about Spring Weeks for freshman/sophomores interested in IB, but they all seem to be held in Europe? Assuming I have the means, would it be worth applying as a US student and attending for a week, or are they not that important. 

I've tried looking into some US companies' Insight days, but it seems there are much fewer and most are diversity based, are there any good US programs (insight days/internships/summits) that are open to all first years?