Hey Jill:
I see we've gotten you over your question-asking anxiety.
Rope-drop is the coolest, especially at MK. It's the opening ceremony that happens at each park.
EMH days don't have a big ceremony, but regular days do.
At MK, everyone gathers in front of the gates and the Mayor of Main St. begins the ceremony around 10 minutes prior to opening. There's dancing and singing and pixie dust.
I don't want to give it away, so that's all I'll say. DW was moved to tears when she saw it and I just thought it was one of the magical things I've ever witnessed.
Epcot has a ceremony which isn't nearly as cool, but I suppose it's worth seeing.
I've never seen what happens at the other two parks.
HTH.