DW and I were investigating this tonight, and here is what we came up with, (verified by another homeschooler who went before).
The main speech, events, and tables are on the 21st at Epcot. This is what the $16 buys you. I say $16, because we got AP's, so we didn't look up park packages.
The YES lessons, on the 21st and 22nd at Epcot and MK, are $25 each person in addition to the event itself and park admission. Each child can be, but is not required to be, escorted by one paying adult. So, both parents cannot attend the YES events with only one child.
So, according to my math, this is what our trip will look like.
21st ~ Main event at 10:15am at Epcot...$16 each x 4
21st ~ Disney's Ocean Discoveries at 1pm at Epcot...$25 each x 4
22nd ~ The American Story at 7:15am at MK...$25 each x 4
The
Tickets page contains this addition to each YES ticket:
*Theme Park ticket or Annual Pass is required to attend Y.E.S. Programs. Parents must pay additional Y.E.S. program fee for admission into Y.E.S. program to attend with student. Only one adult per child allowed into Y.E.S. Program* $25.00