The open jobs include positions for which SeaWorld had recently permanently laid off furloughed employees.
21-year-old Jacob Kaminsky, who died in an accident at the Orlando StarFlyer Monday, had worked on Busch Gardens' Iron Gwazi coaster.
Four of the 10 scare zones will be new for this year's event.
The event will feature only open-air scare zones and the "Fiends" stage show.
Also delayed will be Emperor, Pantheon and Ice Breaker.
Disneyland unions wrote to California Gov. Gavin Newsom, saying they're not convinced the resort can be operated safely for a July 17 reopening.
This is one of dozens of liens filed against SeaWorld by vendors and contractors for unpaid work.
You can make reservations on the SeaWorld Orlando and Busch Gardens Tampa Bay websites beginning at 10 a.m. eastern time on June 8.
Busch Gardens Tampa Bay's reopening plan doesn't include a proposed date for welcoming back guests.