Massive Habitat for Humanity 'Build-A-Thon' underway in Fremont November 28, 2017 ABC & News Bay Area Home News and Media Massive Habitat for Humanity 'Build-A-Thon' underway in Fremont Share More than 150 volunteers began work Friday on a long-awaited affordable housing development in Fremont as part of Habitat's annual Build-A-Thon.