At the beginning of the event - and for a few days (maybe until S8 came back on Monday), if you collected from a coin building (I think it was that or something similar), you would get credit for finishing the 2 hr adventure. I might have gotten credit for it when I had a normal 22 hr adventure still running. The event required two adventures to complete and I didn't even send them out. Several of us got credit for them completing. I started a day late and I think it worked for me on two different parts of this event. Then S8 fixed it. It was an unexpected surprise. I would have been behind the first couple of days because I needed to let my long adventure finish. One time the glitch worked in our favor.
Please tell me about the glitch to auto complete adventures.