Help needed to put zoom on my big screen TV

Need help please!!! ASAP!!

I’m attending the Tony Robbins UPW virtual seminar in a few days and I cannot figure out how to get Zoom on my big screen TV.

Can anyone please help me…???? This seminar is very important to me.

I have the basic zoom.

My TV is an older TV, so it’s not a smart TV. 

I have an iPad (8 gen) and my iPhone 12 pro max… my mac computer is probably too old and I’m not sure how reliable it is for it to stay connected to the Internet as I haven’t used it in such a long time… i’ve been testing it out for a little bit today and it seems to be doing ok, but with something is important I don’t know if I want to rely on it.

I have a Chromecast and Firestick.

I’ve already tried a casting app on my iPad for the chromecast, I can get the video but no audio.

if I go buy a new computer, like an HP or something, then how do I connect that to my TV to get it to stream and do I need to go buy a new computer to do this or other new equipment??

Any ideas??? 

Thank you!!!

Pamela