Do you still need this? I just coded this if you'd like some help.
Basically it boils down to a few things. If you're using API 14?/15+ you can use the CalendarContract. You'll want to query the instances table, because the event table only includes one entry for sets of recurring events. You'll probably want to get the current time (just a calendar getInstance() will do it) and then get the cutoff time for your search by adding a day to the current time.
You'll find examples in the docs that aren't half bad. You may need some SQL knowledge to pull it off properly. Let me know if you'd like some tips. Once you understand what's going on, it's really easy.
If you're using earlier apis you'll have to look into a bunch of contenturi stuff that I haven't really checked out. I assume they're more trouble, but there will also be more stuff online.