Hi there, Chelsea. Thanks for visiting planDisney with your question!
I looked at the theme park reservation calendar for all
Disneyland Resort ticket options and
Magic Key Passes, and it seems like you might have the
3-Day (Monday-Sunday) Ticket Offer ticket. Each ticket option has a select number of reservations, and it seems like September 21 is a popular date that has already had all of the reservations booked, as it is the last Saturday that particular ticket is valid. While it can be frustrating not to be able to book the day you want, I encourage you to keep checking back, as reservations for that day might open up as Guests' plans change.
Chelsea, did you know that
Halloween Time will already be in full swing on the dates of your visit? It is one of the most festive times of the year, and I always love checking out the pumpkin decor on Main Street, U.S.A. Be sure to check out the
Disney Parks Blog Halloween Foodie Guide before your visit, as it showcases some spooktacular treats for the whole family!
Wishing you lots of luck and pixie dust for snagging that September 21st
theme park reservation. Please ket me know if I can answer any other questions for you.
See you in the parks,
Melisssa