Hi, I posted this question over in the Photojournalism & Sports gallery (http://www.thephotoforum.com/forum/showthread.php?p=1332260#post1332260), but it occurs to me that maybe that was the wrong place to put it because I'm asking beginner questions. Basically, this weekend I may be going to a roller derby (as a spectator but I thought it would be fun to try to shoot some low-light action since the keep the arena VERY dark) and I will be going to a horse show (dressage). I'm hoping for advice on tips, techniques, settings, etc... for both. The roller derby will be in a dark arena and the horse show will be outdoors (I believe). Thanks in advance!