Packing for NECC and then THIS!!

I was packing my bags for NECC when there was a knock at the door. It has been a while since someone had played “ding-dong-ditch” on me. However, this turned out to be more than a child’s game. On the ground just out side the door was an envelope that had the following message. It took me a moment to read through it but after it’s meaning sunk in, a cold chill fell over me as I realized its significance. I am now in a panic and don’t know what to do! HELP!!