Is it fine to contact a conference organizer for references to prepare for the conference?
I would recommend against this. Not that it is wrong, but that it is unlikely to get you anything you can't get yourself from a literature search. Most such conferences are recurring, perhaps annual. Find the proceedings of the conference for the previous few years and see what you find. The abstracts of articles may be enough to see what the landscape looks like, though a more careful reading is needed for methodology and such.
But the organizers are busy enough without doing a literature search on your behalf and would probably also suggest looking at previous proceedings.
Read widely to discover the terrain, and deeply to discover the gems.