Might. As in maybe. If I say I might go to an event, don't act all surprised if I turn up, after all, I said I might be there. And don't get all disappointed if I don't turn up. After all, I only said I might be there.
I hate that people use might/maybe as a way supposedly polite way of saying no. After all, we have a number of perfectly polite ways of saying no already. Such as "no thanks" or "not today thanks"