Routers must be used with all Boomset-compatible Zebra printers to hardwire internet via ethernet cables. Conversely, you can use a hotspot in place of hardwired internet.
Depending on the Boomset-compatible Brother printer you are using for your event, you may be able to use either a hardwired internet connection, or a MiFi device to connect via WPS.
See below router options and hotspot options. Note that the hotspot does not have to be Verizon; any internet provider with a USB hotspot can work.