"Official" entry time for MNSSHP and MVMCP is 7 PM but guests are permitted into the park at 4 PM with their ticket. I'm almost positive that I read the original text on the Disney website to say that you could get in at 4 PM with a After Hours ticket but I may be mistaken about that and there's no screen grab to support that.
But now that I think about it, we went to the Finish Line Party in Epcot last fall. It officially began at 10 PM but we were able to enter the park at 7 PM with our ticket. The MK After Hours Party would probably be similar.
I actually had copied the info off the website this am to text to my husband-that's where I got the 7 pm from. You are correct the other parties allow entry at 4 pm (except I think the recent MK DVC parties were also 7)
From Disney's Website this am
Details:
More Magic in Less Time
Treat yourself to a classic Magic Kingdom experience—complete with select attractions, ice cream novelties and more.
By purchasing a ticket to Disney After Hours, you can make the most of a truly magical occasion when Magic Kingdom park lets you in for the last few hours of the day… and then stays open for 3 extra hours at night, just for Guests of the event!
This is your chance to fit in even more theme park fun, all while enjoying many of the most popular attractions and Character Greetings around—such as:
Big Thunder Mountain Railroad
Disney Princess Greetings at Princess Fairytale Hall
Peter Pan’s Flight
Seven Dwarfs Mine Train
Space Mountain
And much, much more!
Ice Cream Novelties & Select Beverages Included!
In the midst of the laughs and thrills, be sure to chill out with ice cream novelties and select bottled beverages—included with the cost of admission—available at carts stationed through the park. In addition, you can also purchase select menu items at Casey’s Corner and STARBUCKS® Coffee and specialty beverages from Main Street Bakery.
And remember: admission is limited to only a select number of Guests. Be sure to purchase your tickets today!
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Call Today to Purchase Your Tickets
Contact the Disney Reservation Center by phone to buy your tickets to this one-of-a-kind special event! Admission to Disney After Hours can be purchased for $149 per Guest (tax not included), and takes place on the following dates:
April 28 and May 5, 2016 from 10:00 PM to 1:00 AM
April 14 and 21, and May 8, 12 and 19, 2016 from 11:00 PM to 2:00 AM
To purchase a ticket for one or more of the dates listed above, please call the Disney Reservation Center at (407) 827-7185 for assistance. Guests under 18 years of age must have parent or guardian permission to call.
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Important Details for Disney After Hours
Learn all you need to know about Disney After Hours—including when you can check-in and enter the park.
[B]Official check-in for the event will take place at the Main Entrance to the theme park beginning at 7:00 PM[/B].
Please note that Magic Kingdom park will officially close to Guests who haven’t purchased Disney After Hours tickets at 10:00 PM on April 28 and May 5, 2016; and at 11:00 PM on April 14 and 21, and May 8, 12 and 19, 2016.
Walt Disney World Resort hotel Guests—including those staying at Walt Disney World Dolphin Hotel and Walt Disney World Swan Hotel—may use Walt Disney World Transportation after the event for up to 2 hours.
Please note that the number of tickets available is limited. In addition, all tickets are non-refundable, non-transferrable and are only valid for admission during the special event date and hours.
All attractions, entertainment and experiences are subject to change without notice.