Hatbox - DAH guests have been able to enter MK at 6pm and receive their lanyards as that time.
This is from
@GADisneyDad14 in the DAH thread:
Guests are given plastic laminated "lanyards" for the event at check-in at the front entrance. This is how Disney knows who is/isn't a DAH guest. These actually make for a nicesouvenir/keepsake and are an upgrade over the standard wristbands Disney uses at things likeMNSSHP,
MVMCP, and EMM. The 2017 lanyard isattached for reference.
Note, you have to get these at the front of the park - Disney does not set up "inside the park" stations like they do at a MNSSHP and MVMCP. Some guests reported being able to pick up their lanyard at Guest Relations off Town Square and the Liberty Square ticket office as well, but reports of success were inconsistent.