I see you trying to spin, but it can easily be flipped the other direction.

If you truly CARE about the folks getting married, you could make this small accommodation and make arrangements for your kids for a couple hours.

If you can't, so be it. Hopefully the host is reasonable enough to understand.

Not everyone can attend every wedding. Sometimes it's too far and expensive, can't take time off work, or you can't get someone to watch the kids. How important the wedding is to you determines how much you'd be willing to stretch to make it happen