Ask HN: How do you figure out/prebook meetups for conventions like AWS reInvent?

My co-founder and I are heading to re:Invent, and while we've always gotten great use out of the technical sessions, we want to build our partnerships and maybe even find a few potential leads.

Does anyone have some tips on what kind of pre-work they've found that works?

Last time we came down to a tech convention, we found most of our meeting through HN, but that was a very long time ago. :)