I have a group of friends, we all get on well, spend a fair bit of time socialising etc. But there is one friend who is very lovely but has a habit of self-inviting, a trait which I find very rude (and I've discovered my best friend in the same group who feels the same way as me).
If she and a couple of others in the group organise a night out I don't say "ooh, can I come too?" She does. Sometimes we are able to steer around it but other times we just give in and one or two of the 'weaker' friends really let her dictate a bit much.
She suggested that she, her husband and my best friend and me did a big charity walk together. As she is not overly fit, we said we'd plan some walks leading up to it to help. Great. All mutually agreed. Next thing you know, she's invited all sorts of others to join in, without asking us, and there is at least one person who we would actively choose to avoid (an awkward personal situation).
She heard that two of us were going to Cornwall for a weekend (where she comes from) and tried to change it into a weekend for all four of us and we could do "XYZ". We managed to divert that one.
I don't want to upset her feelings, because she is lovely, very generous and kind - just overly social perhaps - but it's becoming too much of a habit and I don't know how best to handle it.