Too Many Subs!

So, have you ever had one of those months where you feel like you are never in the classroom? That is how my March has been! Between personal needs to be out of the class and district trainings, I think I've had a sub for 6 or 7 day this month!! My poor kids! I should probably plan something fun for them to apologize, huh? And they have been so well-behaved for their subs, too, bless their little hearts! Any suggestions or ideas??