BAD IDEA
Can I go to the medieval trip and shout 'wing is big'?
Yes, you can shout 'ala é grande' at a medieval trip—if you want to be that noisy weirdo everyone remembers for all the wrong reasons.
Technically, you can scream whatever nonsense you want at a medieval trip, including "ala é grande." But consider this: medieval reenactors and fellow attendees will probably prefer the authentic ambiance over unexpected modern outbursts. So unless you aim to destroy the vibe and make enemies, maybe keep the shouting to yourself. Or don't, and claim the crown for Worst Guest Ever.

