At 7, there are lines of CMs at the entrance to each land. They are checking for wristbands & you can't enter that land without 1. CMs are at the doors to each shop & counter service restaurant, again, you can't get in without 1. The sit down restaurants have limited the time you can make an ADR for without a party ticket. You used to be able to make an ADR for 6:55 without a ticket. This year, most have moved that up to 6:30. Along the parade route, CMs will ask everyone to hold up their wristbands. At rides & attractions, agin, show your wristband to be let on. Basically, there will be nothing you can do or access without a ticket. You will be limited on where you can move, you can only head out of the park.
No wrist band & you will be directed where you can purchase a ticket if still available or to the exit. There was a big problem last year with the first Halloween party with many allowed to stay without tickets. Disney ended up refunding lots of money to people who purchased tickets. Lots of online chatter about what a poor job Disney did with clearing out the park. Pretty sure that won't happen again. Word will get around quick if it does. Pretty sure with tickets to party in October going for $100 a piece, they'll make sure everyone pays.