I think I spot Katie/Mike in top row on the left. Maybe Grandpa Brajkovich on the far right middle row. But no clue on all the rest of these souls.

Top Row, LtoR:
Katie “Little Grandma” Brajkovich
Grandpa Mike Brajkovich

Anyone know the rest of this crew. I agree with Ruth, the Groom looks like Mike, maybe a brother. About what year would this have been?