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rhb-
Sorry I totally missed this! No, I couldn't get script to work so I set it running with the Pi being charged by USB power bank, disconnected the ribbon cable and power from the LED Matrix board and re-connected it at the venue. It worked fine.
Would still like to get it working, but not a priority now
EB
Thanks both.
So very roughly I cloned the github
Installed Python 3
Went into the Python dir
And this is the command I need to run at startup/boot
/rpi-rgb-led-matrix/bindings/python/samples $ sudo python3 runtext.py --led-cols=64 --led-gpio-mapping=adafruit-hat --text="My Snarky Message Here"