Food will be catered. Most likely choice will be El Jefe Tacos. Great food, including Al Pastor and Birria meat,

Ruben Romero Ramadas at Kiwanis Park in Tempe Arizona. https://maps.app.goo.gl/eCZEQZpyAj7K7yKD6

While the wedding party will be more formal than the groom would like, everyone is encouraged to dress however they please. Jeans and T-shirt is fine.