Plus one?

You have considered no plus ones in your mind and heart. Don't go out of you way to invite those your not knowing of including your sister's new boyfriend. Names of the invitees are what we did put on the invitation mailing address and number of guests on the RSVP portion of the invitation. This avoided any other way to include anyone else to invite beyond the limitations.

I personally if i was in your shoes would say no. I am allowing a plus one for my brothers but thats it and honestly im thinking its so i can embarrass them lol (they are both younger then me). I think it is very fair to say you will get back to her closer to. also MEET the guy. weddings are supposed to be intimate events. you dont know this guy and it will be just weird. i have been struggling with my MOH because i did invite her boyfriend. if he doesnt come then thats ok (very shy guy) but obviously he cant be at the head table. he can be at the closest table but thats still awkward.

1. Don't feel bad to tell guests that RSVP for 2 instead of their allotted 1 that due to cost/capacity/etc. that at this time you only have room for them and then tell them you will get back to them closer to the date - but realistically if you get lots of no's then I would say it doesn't hurt to add them to the list if there is room/money.

2. Tell your sister that a) not atm since they haven't been together for 1 year / lived together but that her plus one is automatically top of the list when it gets to your wedding if they are still together - BUT that he will be seated most likely with your parents or your friends that aren't in the head table. I'm sure that last part won't matter though since you are only seated for like a couple hours tops.

3. I thought the same thing but my BM's bf just hung out with the GM for the getting ready part and then made sure to be out of the way till after supper - they don't want to be a distraction just as much as you don't want them to be. They know it's all about you and your FH.

We had a smaller guest list (only 100) and kept it to just family. So we were very selective with our plus ones. Anyone who had been together, or who I had met got a plus one. If they were younger, or just got into a relationship, I did not include a plus one.
I would give your sister a plus one regardless of who it is, just because its your sister. My Uncle was not with anyone when we sent out the invites, but I let him bring a plus one if he wanted to. I told him he had until the day before numbers needed to be to the venue to let me know if he was bringing someone or not.
So for us, if they were immediate family, they got a plus one regardless, but cousins etc did not just so we could keep our list down

We're also sticking to no plus ones to anyone without a significant other. But my sister has also been dating a guy since the summer. By the time of our wedding, if they're still together it will have been a year and he'll obviously welcome to come as her date. So when I sent out our Save the Dates, I addressed her's only to her and told her that it felt a little premature to list his name on the envelope but that if he's still around by then, he'll be welcome to come.

I agree with Meaghan and Megan. I've never understood the rule of "they have to live together, or be together for X years" to be invited as a plus one. If people are coming to celebrate you getting married, they should be welcomed not judged for how long, or how little, they've been together.

If budget constraints is the bigger issue - you may need to cut out some guests entirely? Or use an A, B and C list once the RSVPs start to come in.

I agree with Meaghan. Plus, they're going to enjoy the wedding so much more if they have someone they can relax with while you're busy mingling or dancing. Traditionally, it is also even more important to invite a plus-one for your bridal party. They do so much for us, it is a nice way to say thank you to allow them to have a partner with them, especially one that they are in a relationship with! 4-6 months also isn't an insignificant amount of time! That's nearly half a year. Typically, there really isn't that much for bridesmaids to do once the ceremony is over. I'm also very Team Put-the-plus-ones-at-the-head-table-to-thank-your-bridal-party-for-all-they-do!