You should be ok to visit either Epcot or Hollywood Studios as we expect average crowd levels there. You should probably try to avoid Magic Kingdom or Blizzard Beach or as we're expecting a fair few people to visit there.
There aren't any morning Extra Magic Hours planned at any park today.There aren't any evening Extra Magic Hours planned at any park today.
If you don't plan on watching evening fireworks or other events during the day, try and visit the most popular and busy attractions when said events are on. Since a large number of the parks visitors will be at the event, you should find the rides are fairly quiet.