Specifically, I've worked the last three or four "Monthly Mass Mailings of Doom" for WUOT. I really don't want to work this month (Monday the 29th), because it's been a long month already and I'm tired, but I won't be able to work July since I'll be at EFAM (IAAP Educational Forum and Annual Meeting, formerly known as International Convention and Educational Forum, aka "International").
But if they're depending on me . . . .
Based on the information above, am I obligated to work this month's mailing?
ETA: Okay, lots of fast responses. I will respond to this month's "invitation" with "not available June or July, but try me again in August".