I took my son today to his Karate lessons and stayed for the entire class. I had my camera gear with me and was being a 'dad', but not distracting (thank god for ISO 1600). The Dojo is well lit, albeit fluorescent and is in an old mill. They retained the original mill flooring, slathering on a thick layer of sealant to remove the chance of splinters. The mill itself could keep a person with a camera busy for hours (days).
We head to Boston tomorrow, but I don't expect a photographic side trip (I will carry the LX3 at the very least though).