NC, because this will most definitely be immediately identifiable to anyone even vaguely familiar with the situation:
My new team member (let's call them 'Taylor') has accidentally invited a non-team member to our team event - and it's really not their fault as much as that of my boss ('James') - i.e. their boss' boss, whom they obviously wish to please:
All of us (new colleague, boss and myself) work for firm A - we're consultants for firm B. Firm C also consults for firm B. Taylor recently started with us and knew another team member, an employee of C, from a previous job.
I recently introduced Taylor to James and, in the course of the general small talk, Taylor mentioned that this was someone they'd worked with before and who was great. Cue James encouraging Taylor to sign them and, regrettably, using the sentence 'well, you could always invite them to the team event next week - we look most attractive as co-workers when we're all drunk!'
That was obviously hyperbole - what James meant is 'do, in earnest, try to sign them if you can - the part with the team event is, of course, a joke'. Unfortunately, subtext is usually something people only get about others some time after having spoken to them for all of 3 minutes.
Long story short: Believing her new boss' boss to be a tad weird but themselves being eager to please, Taylor invited former colleague from firm C to our (firm A's) team event - the guest list now includes A's entire project staff, ranging from recent graduates to upper management, and random guy from firm C who only knows one single person there.
This is awkward as fuck!
Then again: disinviting someone is also awkward as fuck!
I tried to get around the situation by inviting a bunch of other folks (other consultants and clients) along in order to make it more of a 'meet-up of random folks working in the same general area' thing - but since we're all re-negotiating our contracts at present, nobody's really allowed to speak to each other right now, so I've not really managed to dig up people. Also, the venue can't accommodate a much larger group.
So WTF do I do now?