Late night train/ tube

[Ineedaholidayagain]

I want to go and see Iron Maiden next year but planning I can get home safety.
Concert is in London stadium which I believe is Olympic park, near Stratford.
I live west of London. Can drive to maidenhead, high wycome, amersham or any tube with a car park.
I'm meeting friends there but travelling alone.
Any ideas? The tube finishes really early and I don't want to be stuck. I do need to get home that night.

Possibly Elizabeth Line (Maidenhead to Stratford and back again) but I'm not sure of the last train times from Stratford.

Parking at Westfield Stratford is surprisingly cheap (by London standards). I’d book a parking space there if you need to get home.

I can't imagine the concert will finish so late that you can't get a Tube and train. TfL planner for tomorrow night shows latest Tube from Stratford with onward connection to Amersham is about 11.30pm.