Hello!
I created something similar to an archviz in unreal and am turning it now into an interactive experience to allow users walk through my map and do simple interactions.
I am planning to allow users to use this app at a large event by scanning a QR code, I am trying to find a way which have the least friction for clients to play it.
Ideally, they just scan the QR code that takes them to a server were they can play the interactive experience on their phone online but each one of them will have thier own session.
Can you guide me to the best way to achieve this?
I am new to unreal game development so bare with me 
Thanks in advance.