Yes, you can visit Disneyland Park during the Oogie Boogie Bash, but the event itself takes place at Disney California Adventure Park (DCA). Because the Bash is a "separately ticketed event," DCA typically closes early to the general public (usually around 6:00 PM) on event nights. If you have a standard day ticket for DCA but not a Bash ticket, you will be required to leave the park. However, Disneyland Park across the esplanade usually operates with normal or even extended hours during these times to accommodate the displaced crowds. If you have a "Park Hopper" ticket, you can simply move over to Disneyland once the party starts at DCA. It is a common strategy for guests without Bash tickets to spend their morning at DCA and their evening at Disneyland. For those attending the Bash, your special ticket usually allows "mix-in" entry to DCA three hours before the official party start time, giving you a total of eight hours in the park to enjoy both regular attractions and the spooky exclusive festivities.