SeaWorld will now be open Thursdays through Sept. 6.
The hard-ticket event will open only part of the park and six rides, including three coasters.
Busch Gardens Williamsburg is one of three SeaWorld-owned parks that remain closed.
Two Epcot area resorts are now set to remain closed until further notice.
Disneyland's theme parks have been closed since mid-March with no reopening in sight.
Theme park notes: Busch Gardens Williamsburg capacity battle / Disney glitch / Legoland California delay
Virginia State Sen. Tommy Norment called the capacity restrictions keeping the park closed "myopic and devastating."
143 workers at the Paddlefish and Terralina Crafted Italian restaurants at Disney Springs will be laid off.
Disneyland unions wrote to California Gov. Gavin Newsom, saying they're not convinced the resort can be operated safely for a July 17 reopening.