I have been away with some friends recently and we had a good time. Organising it was a pita (people need constant chasing, asking information I had already posted on FB more than once etc). We have been discussing what we may like to do next time, however as this won't be until after this time next year, I am not really thinking about it at the moment.
One friend in the group has decided to arrange the same event again (the last time I knew we were talking as a group about doing something different and discussing ideas) and she has set up an event on FB asking who wants to go as she wants to book it ASAP. The date is over a YEAR away!
We are hoping to move within the next year or so, most likely around the time she is planning this event for. She has also invited the whole world! I kept it to a group of friends who all knew each other as I thought this was better when having to share rooms and accommodation etc. My friend though has invited her family, another friends family, various friends that no one else knows and said to anyone else to add who they like. Surely the point in going away as a group is that you are actually going away with your friends? Or I may just be a bit or a misery. 
I had a good time and would love to do it again but I don't really know if I want to commit this far in advance, I can't afford to lose any money so don't want to pay the deposit then lose it, or pay all the money and need to pull out. I also feel a bit 'funny' about sharing with people I don't know, no matter how nice others tell me they are. I have health problems and my friends know(ish, they don't always get it really) but I don't want to have to constantly explain to a bunch of strangers why I can't do this and why I need to rest etc. I find it a little humiliating when I look fine and I know people are wondering "but you look fine, why are you sat down yet again" etc.
Would you suck it up and just go knowing that the weekend will be good although not without potential problems (friend who is organising wants people to mix and is likely to want to mix us all up in the accommodation rather than putting friends with actual friends) or not commit this far in advance?