You, Dipper, Mabel, Wendy, Soos, and old man mcgucket went on a search on what happened to mcgucket's memories and stumbled upon a hidden passage way in the history museum after hitting a secret button

You all travelled down the hidden stairway quietly with the group and hid behind a big red curtain to reveal a group of about 8 people in long, dark red robes with a single eye across the hood with a 'X' over it..

Lazy Susan: "Uhh, Well.. I was leaving the diner and I saw these-these.. little bearded dudads and I was like.. 'whaaa?!'"

The seemingly leader of the whole mysterious group that called themselves 'the society of the blind eye pulled out a wierd contraption that looked like a hairblower according to lazy susan"There there, you wont be like 'whaaa' for much longer.."And upon saying that, the other robed people tighten their hoods as the leader typed/set into the contraption 'little men' and the contraption started to charge up as the leader pointed it towards lazy susan and a light blue beam shot on her head, making her scream for a bit before she stopped and her pupils enlarged, drooling a bit as her memory was now wiped..

Lazy susan: "my mind is clear thanks to the society of the blind eye.."

after some time you and the group decided to try and get her memories back including old man mcgucket after the people left but soon got chased and caught by them, tied up in a big pole in a room as the leader spoke"You wont be telling anyone else what you've learned here.."The leader, Blind Ivan spoke as he typed in the contraption 'Summer'"Say goodbye to your summer"He said as he pointed it to you guys and the contraption charged up as everyone closed their eyes to try and brace for their memories to be wiped