Hello there, Gizelle! Welcome back to planDisney. You've brought us another great question.
Your Disneyland visit is approaching and before you know it you will be walking down Main Street, U.S.A. If you have a
Park Hopper ticket and have made a reservation for Disneyland Park, you will be able to visit Disney California Adventure Park after 11:00 a.m. that day. It is true that you would not be able to enter the second park if the park is at capacity, but I wouldn't worry too much about that. In all of the years that I have been park hopping, I have never been turned away for the park being at capacity. Now with theme park ticket reservations, there is less chance of this happening. I would only be concerned about this during the busiest times of the year, like Christmas Day.
If you are a Marvel fan, you will be there for the last day of
Rogers: The Musical. You will find this performance at the Hyperion Theater in Hollywood Land. I suggest checking the
Disneyland app for showtimes and if the virtual queue will be open to secure a spot. Otherwise, there is also a Premium Viewing Experience you can purchase until it's sold out at the podium located near Stage 12.
Gizelle, I hope you have a wonderful time park hopping and enjoying all the magic of Disneyland Resort! See you real soon!
Carrie