Hi busker42,
You've reached the right place - here I am, happy to help, responding to your request within 3 hours of you placing it. There is no phone support because i'm just one person, not a company. Not sure why you had the impression that a company produced this app, as it is in the app store as "Timothy Carr"...
You have two options:
1) You can bring a portable plug-style wifi router to your events. Many wifi companies make these. Example:
https://www.amazon.com/D-Link-Systems-S ... +companion
2) You can connect the ipad directly to the camera, and use BluePrint to print. There's help here explaining how this works -- you need a second iOS device like your iPhone:
https://wifibooth.com/article/blueprint/
If you get stuck, ask here.