What should guests wear to a weekday wedding?

A weekday wedding is still a proper wedding, so the dress code on the invitation is your guide. If it says black tie, wear black tie. If it says lounge suit or cocktail, dress as you would for a Saturday celebration. The main difference is practical: you may be commuting, sitting in an office all day, or heading straight to the ceremony. Choose shoes you can walk in, and bring a smart jacket or wrap because UK weather can change quickly, even in summer. If the ceremony is in a church or register office, avoid anything too casual like jeans or trainers, unless the couple has said otherwise. For an outdoor or marquee wedding, add a warm layer and consider a small umbrella. If you are coming from work, you can freshen up in the venue loos, but avoid bringing a large work bag to the ceremony. The couple has planned a lovely day, and your effort to look polished shows respect. When in doubt, ask the couple or a member of the bridal party. They will be happy to clarify, and you will feel more comfortable knowing you got it right.