A live stream of the event is probably considered an unreasonable request/accommodation because there is a lot involved in making that sort of thing happen.

First of all, a separate room would probably cost them more to rent than your fees to attend.

Second, they would have to get cameras and mics set up, and if they wanted to do it right (at a high production quality) then they would have to get several cameras and mics and mixers and lots of other gear. Just a rental of such things could reach tens of thousands of dollars... there would have to be testing and more crew to operate it.

And lastly, streaming technology is still cutting edge in some respects... they would have to make sure that the place where the convention is taking place has the proper IT infrastructure to be able to support streaming an event live. We are talking about having the right switches, cables, bandwidth, the whole nine yards.

Is there a reason why this convention is so important that you attend it now and not just wait until next year?

What kind of convention is this?

When is this convention? Streaming an event live takes a long time and energy to plan in order to do it correctly.

Can you get a DVD of the convention afterwards?

Take the refund gracefully.