thats something I had wished I had known!!! I wasted an entire day entering the park at 3:30!!! I didn't know if I had waited I wouldn't have had to use a park day!
Look for the MVMCP banner over the turnstyles. Usually the turnstyles used for MVMCP guests are on the right. Cast members will place the MVMCP on your wrist at/just after the turnstyle.
Go enjoy a couple of the attractions.
At park closing (as in park is closing for MVMCP) cast members will begin to check for wristbands. You will then be directed over to Tommorland.