Why do you need to print if you have a digital copy? Also, does it need to be full sized?
Depending on requirements, a full sized printer might be necessary, but for practical purposes, I wonder if a mini printer usually reserved for photos would also work fine if the print out was legible. I agree with the previous comment that the printer power draw is a bit high.
A mini printer might also be useful for printing off some pictures of the event on the fly. The paper and ink might be slightly more expensive, but not prohibitively so IMO.
https://www.amazon.ca/Polaroid-Wirel...tag=19ghcan-20
This is smaller than the Lexmark which apparently retails around $210 already.
https://www.amazon.ca/Polaroid-Premi...tag=19ghcan-20
It's about $40 for 50 photos and about $125 for the printer.
For a full size printer this one seems a little more practical than the one you were looking into. It's almost $300 including extra ink. $240 without the extra ink. It also has a built in battery for the printing.
https://www.amazon.ca/Canon-Wireless...9ghcan-20&th=1
I don't have experience with these products, but if you wanted small and cost wasn't a major issue, the above seems smaller and better for your needs for just slightly more in hardware and operating costs.