As the title says, my friend at work/colleague is having a leaving party/get together next Saturday and I don't know how to get out of it without looking bad. We have been known as office buddies for years so I know it will look bad if I don't go; I'm not a social person, I don't drink, and I know if I go she'll want me to stay and carry it on in town, or in the next pub and I'll hate it. How do I get out of it? Just saying "I can't I have plans" won't fly, she'll keep asking me what do I have going on, and everyone at work will want to know what's "more important" than my friend leaving.