How to promote young researchers at a conference designed for young researchers?
This reminds me of maybe relevant idea. When I went to a summer-school on mathematical physics in Heidelberg, the organizers made a "Gong show". The idea was that everyone had to stand up before the auditorium and introduce themselves, both professionally and personally. The point of the gong was that you got only something like 2 minutes to do so, then the organizer hit the "gong" (he hit a glass with a spoon I guess) meaning you should finish. After that came 2nd gong and after the 3rd you had to go off stage. This was very nice as even the speakers attended this event and introduced themselves.

Moreover it really helped that we were given as a part of the conference materials printed list of names and email addresses so we could take notes on who is who.