Ladydancer, you can get the bracelets no more than 2 hours before park closing. You can also get them after EMH evening starts, just be sure to have your resort card for each person. There are several locations where there are given out, the locations are listed on the EMH evening schedule
available at the entrance. We had the best luck getting them after entering MK at the Plaza Rose Garden and at the Caribbean Plaza (Pirates). There were at least 3 CMs there checking resort cards and putting the bracelets on.
The EMH evening schedule also lists which attractions are open. There is a separate EMH morning schedule that lists which attractions are open in the early mornings. Both schedules have which parks have this benefit for the current week.
FYI, more attractions are open during evening hours than the morning hour.
For example, the only rides open in the am at Epcot are Mission Space,
Spaceship Earth, Test Track and Universe of Energy. At MGM the only rides open are Muppets 3D, RNR, TOT, and Star Tours. At MK Buzz Lightyear, Carrousel, Tea Party, Winnie the Pooh, Peter Pan, Snow White, Space Mountain, Stictch, and Indy Speedway. Adventureland and Frontierland were closed until 9 am (I could not get in to get a fastpass). At AK Discovery Trails, It's tough to be a bug, the Safari and Pangani Forest Exploration Trail.
Good luck!
Our experience last week was that EMH morning at MK was busy. I also thought it was busy at EMH evening at MGM. I kind of like the idea of going the morning after a EMH evening at a particular park, but I like mornings better period. I find riding standby right after opening and grabbing fastpasses for later use works best for us.