Hello there Christina,
Welcome to planDisney and thank you for your question! One of my family's favorite parts of the Holiday season is the
Disney ¡Viva Navidad! Street Party!
It's so fun to participate in this fun fiesta and then enjoy some Mexican specialties offered at the nearby
Paradise Garden Grill.
It has been officially announced that you'll be able to meet Mirabel in a nearby area that resembles the casita, but there haven't been any news about whether or not José and Panchito will be sticking around after the street party to say hello.
When there is a specific character I'm hoping to meet, I've had the best luck using the
Disneyland Resort mobile app to see if they'll be around that day. If you navigate to the map tab and tap the down arrow next to "Attractions" in the top center of your screen, you'll see a drop down menu where you can select "Characters." Once selected, I like to then tap "Show List" to scroll quickly through and see who all will be around the parks on a given day.
If you see someone you'd like to meet, you can tap their entry and it'll show you a time range of when you can expect them to stop by as well as an option to find them on the map! It's super helpful. You never know who might be stopping by on any given day, so this is the best method to check.
Thanks again for your question, Christina! I hope you have so much fun on your upcoming visit to the Happiest Place on Earth.
Have a Magical Day,
Greg