The Sterling Prestoncelebrations for joining the SEC just mean more for Oklahoma and Texas.

After agreeing to join the league three years ago and negotiating a settlement with the Big 12 to leave one year early July 1 is the official day the Sooners and Longhorns join the SEC. Both schools are going all out to mark the occasion.

Texas is celebrating Sunday, one day before the official move with an "all-day SEC Celebration" that includes a performance from a Grammy Award-winning artist, while Oklahoma will begin its celebration that day and carry it into the first official day as an SEC member. The SEC Network will also be at both campuses hosting shows to welcome their new conference members.

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Here are just some of the things Oklahoma and Texas have schedule for their welcome to the SEC:

Texas plans large SEC celebration Sunday

Texas will host a free event across its Austin campus starting at 2 p.m. local time, which will include interactive games, activities, food and drinks for fans. Campus museums like the LBJ Presidential Library and the Texas Science & Natural History Museum will have free activities beginning at 1 p.m. local time.

Fans will be able to take part in multiple photo ops, including with the iconic Bevo and the Longhorn Band. Texas-SEC merchandise will also be available to purchase. The SEC Network will be broadcasting live from the Main Mall from 5 to 9 p.m., and the same area will also hosts concerts from several artists.

The main attraction of the night will begin at 8:30 p.m., when SEC Commissioner Greg Sankey and university administration will hold a ceremony that will officially welcome Texas to the SEC and have a fireworks show. Afterward, "Mr. Worldwide" Pitbull will perform a free concert.

Oklahoma has two days reserved for SEC celebration

Oklahoma's festivities will start late Sunday night with a Race to the SEC 5K Glow Run at 11 p.m. that will culminate inside of Gaylord Family-Oklahoma Memorial Stadium. When the clock strikes midnight, there will be a fireworks show as the Sooners officially become an SEC member. At the same time, there will also be a OU-branded SEC merchandise sale at a pop-up shop inside the stadium.

On Monday morning, Oklahoma will host "Wake Up in the SEC" events in Oklahoma City and Tulsa at 8 a.m. with university administrators, current and former coaches, as well as the band. From 11 a.m.-1 p.m., pep rallies will be held throughout the Norman area.

The SEC Network will broadcast from inside the football stadium from 2-8 p.m. and will host a "Party In The Palace" event at 5 p.m. on the field, which have several activities and photo opportunities, as well as live music. At 9:30 p.m., a pep rally will take place with university administration and the event will close with a drone show.