It's a terrible idea. This happened to me and DH, (some 20 years ago,) at a wedding of a work colleague of DH's. Even though we weren't split up, there was a big reception of about 120 people - all on tables of 12. We were on a table where we 100% knew NO-ONE. Not a single one of the other 10 people! They all knew each other and were either related, or were neighbours, or work colleagues.
We'd never seen any of them in our life, and we just talked amongst ourselves as the end of the table at the back of the room, because despite several attempts to engage with them, they all just pretty much turned their backs on us..
It was really awkward. They could have put us with 3 or 4 of the colleagues who DH knew. But no, they stuck us on a table with 10 people who we've never met. It was so strained. I was glad to leave.
I think if I've gone to a wedding on my own, and they put me with a bunch of people I don't know, I probably would have left to be honest. Just said I feel ill, and said I was going. If they refused to move me next to DH if we went together, I would leave, and he would do the same.
What a terrible idea trying to get people to mix and chat to other people they have never met - at a wedding. The vast majority of people don't want to do that at a place like a wedding. They just feel isolated, and awkward, and left out.
I really hate people trying to force me to socialise with people I don't know. You get this is Church, and hobby groups, and on courses too. I think most people hate it actually. Conversation, friendships, and relationships should be organic and natural, not forced.
And splitting you up from you husband or wife - at a wedding - is fucking weird. Why would anyone do this... ? 