Help Required: How to Speak at a Conference Remotely Using WebRTC?

Want to suggest a service I'll use for a conference?

I love dog fooding on WebRTC. I am now making more calls with people on Tawk.com or other WebRTC services than on Skype when it comes to a one-off/ad-hoc conversation. Why? Besides dog fooding, it is a lot easier to just send a URL to someone and wait for him online at a designated time than it is to exchange Skype IDs – it seems a bit less obtrusive to me, and it doesn't clutter my already cluttered buddy list on Skype. So now that I've proposed and been accepted to a talk at the IIT RTC in Chicago in two weeks. Now, that being almost 10,000 kilometers away from where I live, coupled with another flight I need to take in that same week meant it was impossible to be at the conference. Good thing that my presentation's title was "How to Speak Remotely at a Conference By Using WebRTC"… I'll be doing a session remotely in this case, and I wanted to do something different instead of the usual drill down of a specific angle of WebRTC. What I plan on doing is use a couple of different WebRTC services that exist today and skim through them – showing the power and possibility of the technology to a remote audience. Now it is your turn: I am now making the list of services I'd use for the session – planning my talk. If you have such a service or think of a suitable solution I should be using for the session, then please comment on this post. What I am looking for:

1. Obviously, the ability to hear me
2. Ability to show my webcam
3. Ability to share something – either by uploading it, direct screen sharing or even browsing together in a collaboration session
4. Any other cool thing you think can make this interesting for the audience in the room

The above list is optional in the sense that I don't need all of them in the same service as I plan on switching between several different services. Help me out here :-)