Hey @LL7!
Welcome to Square 🙂
Is this truly a one day, one day event? Or one day for now?
Square doesn't rent hardware (that I know of) but if you're looking for low investment, I would recommend purchasing a Square Reader for contactless and chip I'm not sure if your customers would need to interact with a screen/device for any reason, but if they didn't I reckon this would be the most straight forward method for accepting payment.
If you were interested in a slightly higher investment for even greater functionality, then I would suggest going up to the Terminal. An all-in-one solution that doesn't require a secondary device.
Take a look at those pages and let me know if you have any questions! Just be sure to tag me ("@" and my username) to ensure I can see it. 🙂
