I have received an invite by text from someone and cant think of a kind way of declining. I dont know them well, but enough to know they are lovely people and it's a real kindness that they have thought of me. However, I wont know anyone and it's really not my sort of thing. So how do you say you cant make it in the nicest possible way without it sounding like a lame excuse. Sorry but my mind has gone completely blank and I hope somebody here can help me out.