Inviting colleagues

If they have long-term partners or husbands, you have to invite them. There’s no way around it, it’s rude if you don’t and I wouldn’t expect these co-workers to attend your wedding if they can’t bring their spouses.

Unfortunately I don't think there's a way around this, especially as there are only two of them. If you didn't invite their partners, they would be pretty alone on the day

Is it a number thing or you just dont know/ care for them? I think you should expect that if they are in a commited relationship that they would expect to bring their SO. If you put yourself in their shoes would you be offended if you were invited but asked to come alone. I agree that perhaps they should just be invited to the reception or not invite at all.

Again, if it's a serious partner or their husband/wife, there's not a great way to word it so that only your coworker is allowed. I'm having a similar issue with one of my aunts, who's husband is a mean drunk/would get into a fight. He works in Iqaluit with a fly-in/fly-out 2 weeks rotation so I'm hoping my wedding is when he's there.

You could talk to them and let them know that there would be only room for them and not any S/Os, however they may not want to attend without them.

That is a hard one. If they are both single and not in a serious relationship then that’s ok. If they are married, engaged or serious relationship that’s hard to get around.
You could let them know there is only so much room in your budget for 2 and not 4 people.
Have you met their SO? If you have I think it would only be right to invite them. If you haven’t then you can use that as a reason as to why you are only inviting the 2

That's a hard one.... If they were only dating and not yet engaged or married I would say you could get away with it easy but with them being married it's probably going to come off bad no matter how it's worded.

If you really can't ask their S/O's to attend then I would see about not inviting them at all or waiting until closer to the wedding and saying that you only have room for them and them alone.

Best of luck!

Are you inviting other colleagues who are allowed to bring their plus ones? If so it will make it hard to do this. One way is basically only having their name on invitation, and the rsvp is the same as everyone else's. If they reply saying 2 people call and let them know you weren't given a plus one. If you don't want their other half coming, I would invite to reception only this way doesn't matter if they come or not