Going to her bf’s family wedding as a couple for a weekend without me (cuck)

Is she likely to encounter anyone you or she knows? In practical terms that’s an important consideration. Even if that’s unlikely to be the case, I can see that it’s a big step for all three of you.

I am sorry to say, and probably this is not what you want to hear, but I think you start losing her. They have a separate life now and you start becoming less and less part of it.

You are asking the eternal question—one that virtually every cuckold likely asks themselves time and again, depending on the situation: Should I feel fear and jealousy about this, or joy and support?
Look at it this way: If your wife has a date with her Bull, and you aren’t part of it, that is something that was actively initiated by them. Accepting an invitation to a wedding, on the other hand, stems from a passive motive. For your wife, it is actually doubly passive, since the wedding isn’t taking place within her own family, but rather within the Bull’s.
I would find your question—regarding how you should react—much more understandable if this involved a vacation that the two of them had actively planned together. But for an event that both of them are simply attending out of social obligation? I don’t think so.
Or are you afraid of being outed? In my opinion, there are far more “dangerous” situations where that could happen.
Whether you are starting to lose her is something I cannot say. But that risk is inherent in any cuckold relationship—you knew that already—and how you react to this particular situation makes no difference.

Hi Joe. Sounds like you are a very experienced couple. Your wifes bf wants to take Lola on a date. She will meet his family and be introduced as his girlfriend I guess. There will be food and drinks, likely music and dancing. Lola will be with him all night in a very public environment. They will be close in front of many people. They will all know she will be spending the night with him. You will be sitting at home thinking about her and it sounds like in a very worried state.
Have the two of them been away for a night before? Did this also overly concern you? That would also likely involve a dinner and publicly being seen. For me when my wife was dating I would also experience doubts and worry she was drifting from me. I would be pacing and fretting. However, the doubts and worry mixed with anger, regret, confusion, jealousy and extreme anxiety, all combined to give me the most powerful cuckold angst which I so craved. Nothing compares to it. My guts twisting, my emotions shredded, tears running down my face. But through it all I was ragingly turned on and my erection was throbbing and leaking most of the time. You already know you can’t say no to this. I would enjoy it whilst you can Joe. Embrace it and look forward to the day and night you will be in cuckold heaven.

Rob