I do this sort of thing all the time!

Group 1.
Nikon D70s - Sigma DC 18-50mm 1:2.8 EX MACRO - Nikon SB-800 Flash
18mm ~ f/10 ~ 1/125" ~ ISO 200 ~ Flash Mode TTL BL (iTTL)

Shot around noon. Number of people: 32.

Another shot...no flash this time.

The Group Shot
Nikon D70s - Sigma DC 18-50mm 1:2.8 EX MACRO
21mm - f/10 - 1/60" - ISO 200