Hi, Leanne! Welcome to planDisney and thanks for your question!
Your trip to the Disneyland Resort is just around the corner! How exciting! It sounds like you have everything set up correctly for your very merry visit on November 11th. You don't need a separate theme park reservation for the
Disney Merriest Nites event, just the special event ticket is all that you will need. And since you have a Park Hopper ticket with a theme park reservation to start in Disney California Adventure Park earlier that day, you're all set there as well. You can begin hopping over to Disneyland Park at 1:00 p.m. and the party officially kicks off at 8:00 p.m.
It's so exciting that you'll get to experience the first Disney Merriest Nites of the year! Be sure to enjoy all six of the uniquely themed parties around Disneyland Park. From the Feliz Navidad Party in Frontierland to the Frozen-themed Party in Fantasyland, there will be so much fun to be had.
Disney PhotoPass downloads are included with your special event ticket, so don't forget to stop by all the special photo opps that will be available for the party.
I hope you have a jolly time at the Happiest Place on Earth!
-Linda