Here are a few solutions to use iPhones as cameras in OBS to go live to EventLive platform.
Using your phone as a web cam is helpful with OBS streaming to EventLive, and also for your calls on Zoom, Meet, Teams, Skype, Slack, Google Chrome, Cisco Webex, etc. It usually is much better quality than other webcams.
ElGato EpocCam (Recommended)
https://www.elgato.com/en/epoccam
Check the vendor page for current pricing.
Wi-Fi
iVCam
https://www.e2esoft.com/ivcam/
Check the vendor page for current pricing.
Windows
Wi-Fi or USB
OBS.camera
https://obs.camera/
Check the vendor page for current pricing.
MacOS, Windows
Wireless (NDI support) or USB
OBS Ninja
Advanced
Reincubate Camo
https://reincubate.com/camo/
Windows, MacOS
Check the vendor page for current pricing.
NDI Camera app
https://apps.apple.com/us/app/ndi-hx-camera/id1477266080
Check the App Store page for current pricing.
On slow networks it's recommendable to use USB when possible, to avoid affecting the stream quality even more.