Presentations were so short this cycle that there was no time for demos.
Since everyone asks how we decide how long presentations should be, I'll just answer that now. People can sit for about 55 minutes. Two sessions = 110 minutes. 43 startups presenting means slots are at most 110/43 minutes.
The solution will be to move to 3 sessions. That was inevitable anyway, as the number of startups per cycle increases. It will make DDay as a whole longer, but I think investors will be ok with that, because it is still much more efficient for them than meeting the startups individually.