If your other plans for the summer have you rooted in one place (you already have a "real" job or have to stay with family, etc), I've had great success just calling up local theatres and asking how I can get involved. It's not as common to actually get work as an SM this way, but there's always phones to answer, filing to be done, and other lackey chores to undertake. Most theatres will jump at the chance, and even turn over a large amount of responsibility to you surprisingly quickly. And working in a theatre office is excellent experience to understand the business of theatre. If you're stuck at home and desperate for some drama-love, just call someone up. Sometimes getting involved is just that easy. (Note: getting a job is rarely that easy, however.)