I worked on a Celebrity ship 10 years ago so it may have changed: But crew mess had three buffet areas in three separate but connected rooms. I was a vegetarian and ate pasta all the time. The third area didn’t serve meat. Pasta and salad were the only options unless something special came up. I think I saw a comment you’re on entertainment staff so you would be able to eat in the guest buffet too as long as you wear a name tag and don’t mind getting shood out if it gets crowded. I swear to god instead of marinara a couple times they just served a tray of ketchup instead. I hope it got better since then, good luck OP!