I wouldn't and couldn't leave him under those circumstances.
If it had been a really important event, it might have been different, but my husband didn't need me there, in fact I was never an original part of the equation, just a pleasant addition to the outing. And I am heavily pregnant. And although I have been living in Australia for 4 years, have no clue about football... so, you can tell I really wasn't very enthusiastic about going in the first place.
This said, there were many comments that were helpful for "next time".
I completely and utterly agree that the easiest and best thing to do is to set up a playdate or meeting in advance with the babysitter, where I am present, so that North has the opportunity to get to know her in a secure environment. I will definitely do this in the future- thank you for this great advice.
I will also always arrange that the sitter arrive before his sleep so that he is aware that she is present and isn't startled waking up to someone else.
I do believe that babysitters can be a welcome and exciting new playmate for North and an invaluable resource when you want and need to get out for some intimate time with your partner. It's just a matter of being organized enough, and trusting of your instincts enough to be confident with your choice of childcare.
Again, I just want to say a huge thank you for all of your support and comments. I am constantly floored at the kindness and generosity from people I have never even met. It is so comforting to feel this kindred bond with so many wonderful women, creators, peace-makers and mothers.
I hope you're having a beautiful weekend.