Wedding Dress

Castle destination wedding
Help! I'm going to a 12 hr (so the invite says) wedding and reception in a castle in Poland in late October. Dress code from the invite: Formal wedding attire, stilettos are not recommended due to the uneven ground. The 1st yellow dress has a big stain which needs to be dry cleaned, 2nd maybe too casual, 3rd not my vibe rn, 4th kinda boring, 5th too casual or okay?