Would you recommend software for a group conference + stream?

Question

Video broadcast

Good day!
An alumni meeting is being planned.
There is a desire to broadcast the event for those who could not come, who live in other cities. I would also like that non-residents could connect themselves and send greetings.
The event will feature a large screen, PC and IP camera. You can find other iron.
I need advice on the selection of software that would allow organizing all this. I understand that the most suitable software for organizing conferences. But I would like there to be no connection difficulties, it is desirable to be able to connect from a mobile phone and view the stream from a browser. Connection is desirable to be without authorization. Well, first of all, of course, frivolous solutions are considered.
Thanks in advance!

Answer 1

Try https://proficonf.com/en/

Answer 2

https://hangouts.google.com/?hl=en
Have you tried it?