From the actual registration email:
"These links will only work while the conference is ongoing. At other times they will lead you to our website.
The conference itself uses BigBlueButton. In case of issues please try a different browser. We've had good luck with Chrome, but expect Safari and Firefox to work as well."
Which platform are they using to host the online meeting, by the way? A quick skim doesn't say much, and those pictures are not friendly on my mobile data.