All tickets are cleaned out for In-N-Out Burger’s 75th anniversary celebration more than a month in advance.

The all-day event takes place Sunday, Oct. 22 at the In-N-Out Burger Pomona Dragstrip.

Links to ticket sales have been removed from the website set up for the event, and publicists for the event confirmed in an email that general admission, car race entry and car show entry as well as a separately ticketed “Rock 2 Freedom” concert are now officially sold out.

The festival will run 10 a.m.-10 p.m. on the exact anniversary of the date that Harry and Esther Snyder opened the first In-N-Out in Baldwin Park, Oct. 22, 1948. The chain is now based in Irvine but maintains a large presence in its hometown.

Attractions listed on the website include an In-N-Out Museum, carnival rides and games and live music in addition to the concert, which is a fundraiser for the Slave 2 Nothing Foundation to combat human trafficking headlined by ZZ Top and .48 Special, the In-N-Out “family band.” Its members include Lynsi Snyder-Ellingson, Harry and Esther’s granddaughter and In-N-Out’s owner.

The event will also include anniversary merchandise for sale, according to the website.

In-N-Out has not announced capacity for the festival, but the drapstrip has a seating capacity of 40,000. It’s on the grounds of the Fairplex, home to the LA County Fair.

In-N-Out announced the festival nearly a year in advance. Tickets went on sale in May. The company began to warn people on its website that they were selling out in June.