Mateker's Meat and Catering immediately responded, letting me know which options were gluten-free. The menu was as follows:
-Vegetable medley (naturally gluten-free)
-Salad (they prepared a separate one for me without croutons)
-Pasta and rolls (obviously not gluten-free)
-Tri-tip and Au Jus (naturally gluten-free)
I could eat almost everything, which was a wonderful feeling!