The City Of Livermore’s DemiSemiSeptCentennial Activites July 4th-7thThe City Of Livermore’s DemiSemiSeptCentennial Activites July 4th-7thWhat is a "DemiSemiSeptCentennial"? The City of Livemore is celebrating its 175th anniversary with a a huge slate of events beginning July 4th.Erin GrantErin Grant