The objective of the conference appears to be to build/strengthen a young cryonicist community in the US. If you think this is a good idea, your objective should be to make close friends there, especially among people that you expect to interact with more frequently in the future (people living near you, working in your industry etc).
My advice is that you should not feel as if you need to get to know all 40 participants and the X number of organizers. Three days is not a whole lot of time, but it is enough to get to know some people quite well. The program looks structured in a way to help you screen people easily (emphasis on group introductions) and then give you space to go hang out with them, so identify the (5~10) people you think are worth investing time in getting to know first. Do not attempt to get to know everyone, you just don't have the time or energy for that.
Next week I'll be attending the second annual Young Cryonicists conference, which Eliezer attended before writing Normal Cryonics. I expected there to be discussion about it on lesswrong, but there hasn't been, so here it is.
Reference;
The most official thing I can find about the conference. (PDF)
Normal Cryonics by Eliezer Yudkowsky on Less Wrong