I really like the idea of linking sessions.
The conferences I have attended generally have a themed tracks (BI, DEV, DBA) however the sessions have no relevance to each other and often have overlapping content. If they were in some way connected you could spend the whole day in 1 track obtaining a more complete/rounded learning experience, but still allowing others to chop and change should they wish.
I would love to see this implemented, although can appreciate that it would be incredibly difficult and would involve the participation and sharing of sessions and content ahead of the event. The speakers/organisers already give up so much of their time for the SQL community, I’m not sure you could ask more of them - Thanks guys!