Occupy Oakland and Iraq Veterans Against the War (IVAW), an organisation of which Olsen is a member, put out a call for solidarity vigils on Thursday morning.
The Oakland vigil will be held at 7pm during the general assembly at Occupy Oakland.
A statement from IVAW said the vigil was being held to "hold Scott in their thoughts, to honor his commitment to social justice and to hope for his strong recovery."
It read: "Scott is one of an increasing number of war veterans who are participating in America's growing Occupy movement."
"Oakland has been a public forum, set up on public land, concerned with critical public issues about the nation's financial crisis, consolidation of wealth and power, and the ability of citizens to meaningfully participate in the democratic process. The brutality they were met with sends a chilling message to those who want to serve their country by working for social change."