No. Once the park has closed to guests without party tickets, there will be CMs checking for wristbands throughout the park, in lines at the restaurants/cs places, in the shops, etc. If you don't have a wristband, you'll be shown out of the park. Last year, they weren't even letting people shop without party tickets/wristbands, which surprised me! We were asked four times to show our wristband while sitting on a bench eating ice cream waiting for a show to start during the Pirate & Princess party.