My son and daughter play Munchkins in a local production of The Wizard of Oz. I was able to use flash during the dress rehersal; however, I couldn't stay the whole time. Below is a picture of my son and daughter (the boy and the second girl from the left) using my DS, DA18-55, and Sigma flash.
Of course, I couldn't use flash on night. This left me with my DS, DA 50-200, and a monopod.
1/30 sec, f6.7, ISO 3200
1/60 sec, f5.6, ISO 3200
1/45 sec, f4.5, ISO 3200
I wouldn't want to print them poster size but they look nice at 4"x6" for the kid's scrapebook.
Tim