In *Kingdom Come: Deliverance 2*, wrapping up the "Wedding Crashers" main quest can be tricky if you're unsure where to find the newlyweds to offer your congratulations. Once it's apparent that Otto von Bergow won't be attending Lord Semine's wedding, you'll need to conclude the quest and seek another way to meet him. To complete "Wedding Crashers," it's crucial to congratulate the newlyweds before you depart from the celebration. However, locating Agnes and Lord Semine can be challenging as they seem to be missing from the festivities.
Before you proceed to find Agnes, ensure you've completed any additional activities you wanted to engage in at the wedding. Engaging with Agnes initiates the quest's conclusion, leading you directly to Trosky Castle. By this stage, most of the wedding's extra content should already be explored, as it occurs before the ceremony itself.
While mingling with the guests, you can ask if anyone knows the whereabouts of the newlyweds, but you'll find that no one has an answer. It's okay to skip this task and head straight to where Agnes is located. If you previously pilfered some schnapps from the wine cellar, locating her will be straightforward.
Regardless of your conversation with Agnes, it will end with a man stumbling into the cellar and sparking a massive brawl throughout the wedding. You can choose to stay in the cellar until the time passes or join the fray and fight whoever you can. The outcome remains the same, leading to a cutscene where both Henry and Hans find themselves imprisoned at Trosky Castle.
That's how you find and congratulate the newlyweds in *Kingdom Come: Deliverance 2*. Your next step is to tackle "For Whom the Bell Tolls," the subsequent main quest. Here, your reputation is on the line as you must complete tasks within a strict time limit, adding pressure to your journey.