Hi, Guadalupe!
Welcome to the Disney Parks Moms Panel, and thanks for stopping by with your great question. I love visiting the Disneyland Resort during Halloween Time!
In my experience, once Mickey’s Halloween Party at Disneyland Park is advertised as being sold out online, it’s not possible to purchase tickets in person, either. To the best of my knowledge, no tickets are held back or reserved for in-person purchase.
If there is a date that works for you and still has tickets available, I recommend purchasing them now so you can attend and enjoy the many extras available during Mickey’s Halloween Party, like the Halloween Screams fireworks spectacular, several free treat stations, lively music and dancing, and special character meet and greet opportunities. Plus, everyone is welcome to wear a costume during the party, including adults!
I hope this helps, Guadalupe. Please write back to me with any other questions you may have.
Wishing you magic,
Courtney