The great thing of meeting digitally, is that it’s synchronous. If moderated well, not everybody is speaking at the same time, and the discussion should not be complicated to follow. I have some experience with this through work, so I hope it will be ok 
That said, I can totally understand it if you prefer not to speak up. At work for bigger meetings we always appoint someone who keeps an eye of the chat and brings up any point made there - that works really well. That way you could participate ‘live’ also 
This might be a good idea regardless, in preparation of the whole thing
And another great idea for something we could do during the ‘hackathon’: