I met with my supervisor today and she's moved it to the evening at her house. You could still come provided that I could find out who you are ahead of time so that I'm not bringing internet strangers to her home. If you do come there's going to be 20ish people from the department, and everyone will know everyone else except for you and me.
In order not to derail the rest of the discussion, I'll move the rest of this discussion to PMs.