@tjknitz Check in started at about 7:15 pm, meaning the time you can get your wristband. The CM said that you can go and come back or get in line, we stayed in line. There was a mom with her son in front of us not sure what time she got there. We were able to get an awesome table.
So I would say to get the best tables (all the way to the front and right of the dessert party) check in and get in line no later than 7:30pm
They let us in at 8:30pm but it was their first time setting up without the walls sorrounding the projection tower so once they figure that out I'm sure they will allow people to go in faster.
If they move the dessert party indoors they usually walk everyone out to the reserved area around 9:30pm, if you want to make sure to be close to the front and right side you can leave the dessert party at 9:15pm and they will allow you to go into the reserved area.