I bought my tickets online but it did not give me the option to be interactive. Is that correct ? Do you just sign up for that part once you get there??? Next question, my parking pass is on my phone. Is that ok too? I cannot print it.

The interactive part of the haunted houses are done at the front of the line before you enter. They will ask if you wish to go interactive and if you say yes they will give you a glow stick necklace. As far as a parking pass on your phone as long as they can scan it im assuming it is acceptable.

Yes, you can show them your parking when you arrive and you will get a ticket for your dash. At the front of the two interactive events you will get a glowstick necklace if you decide to interact.

You get interactive collar at head of line when you go into house

At the start you decide to interact..