I have been invited out with about six other women at work. I have worked with there for a year but only 10 hours a week so don't know them that well. The colleague that invited me has left and its a meet up after. I think she invited me to be polite. Probably being oversensitive, but I think they would rather I didn't go because when I asked one of them if they were going she didn't say are you. I just think it will be awkward.