If you look at the list of volunteer opportunities right now (March 26), the first ones you see are in May. To see opportunities that are coming up sooner, i.e., tomorrow, you have to scroll to the bottom of the list.
This is backwards for most of us — I want to know about this week before I worry about two months from now. It also seems like a pretty easy thing for our webmasters to fix, so please consider this a request.