BibTeX does not have the right entry for preprints. This is a hack for producing the correct reference:
@booklet{EasyChair:2799,
author = {Eitan Frachtenberg and Rhody Kaner},
title = {Representation of Women in High-Performance Computing Conferences},
howpublished = {EasyChair Preprint 2799},
year = {EasyChair, 2020}}