That's so exciting! I hope the pop-up goes well, and I'm curious to learn more about it. Is it an outdoor event?
You should have no problem using the card reader on your phone with cellular data. Can you confirm which country or region you're located in and which card reader you have? I can take a look to see if I have information on how long the battery typically lasts. I would also recommend bringing a portable charger with you for the phone if you can.
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