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Ideally, find out their schedule, and arrive early. I'm very, very certain that a Sangha member will be more than willing to help you with etiquette. I'm not sure how rigorous the Theravadans are about how and when you do things, but from my Zen experience, I could tell you all sorts of interesting bits on etiquette.

1) Dress appropriately. I wear all black or a muted color kimono. Depending on their robes, you should dress accordingly. Try earth tones, grey or black.

2) Take your shoes off before you enter the temple proper. There should be a room for shoes.

And this is where I can't tell you exactly what to do. For those of you willing to visit a Zen temple, Zendo or monastery, follow these additional rules.

3) Bow upon entering the Zendo. Never, ever, ever just walk through.

4) Don't make any noise except coughing. If your nose runs, let it, don't blow your nose. You are allowed to sneeze.

5) Try not to move around a lot, or at all, during a sitting. You're going to uncomfortable. Deal with it.

6) When you come to your row, bow the Buddha. When you are at your place, bow across to the other side, even if no one is there.

7) If you see something happening, follow the person across from you. If you're having tea, wait to set your cup down for the next person closest to the altar to put theirs down. It should go in a wave.

That's all I can think of for now.