Wedding Accommodation?

Its nice of you to pay for all. However I don't think you can ask people to share a room with someone they don't know, or tell people they have to stay the night. Its a nice idea but people might have other plans. Obviously if people decide to share thats fine. But assuming that friends from different groups are ok sharing or mixing man/woman that are not dating is not OK. I think you can always offer free accommodation and see if people are suggesting sharing themselves. Taking into account that some might want a room for themselves or some might not want to stay the night/ do breakfast. Its a lovely idea but people might have other plans.
So I would offer free accommodation and then just see who takes you up on the offer. Maybe some friends pair up by themselves? We have accommodation optional at our wedding and stated availability on our homepage so people could just call us if they like to stay and we would update the homepage whenever someone took a room/cottage: some were keen to book, others preferred to stay a bit away and have a family/ romantic weekend before/after the wedding themselves, others had commitments the following day and are going to leave after the party or early morning. All fine by us. Generally close family were happy to stay but people with kids preferred the option of privacy away from everyone. And I wouldn't have asked friends to share unless they decided that themselves (I know its strange to think about it but sometimes singles end up hooking up at weddings and how awkward would that be sharing a room?). All the best for your wedding when it comes

View quoted message Hi,

Thank you for the advice, and most of our guests are couples or have been friends since year 5. So I don't think they would mind sharing but I will ask them all individually to see what they want to do I think.

Probably get the bridal party to stay but see what the other guests say.
Thank you for the advice

On the face of it its sharing with people you know but they may still be a little uncomfortable with it as they may not know each other that well or want to know each other that well. An alternative is to find additional accommodation nearby and ask them to meet you all for breakfast in the morning if your hotel permits it.