From Pima County's website:

"You can help make sure Pima County doesn't miss its shot.
 
As the rollout of the COVID-19 vaccine accelerates, volunteers are needed to help staff the effort to get shots into our citizens' arms and protect our community against the virus.
 
Volunteers at our vaccination points of distribution (PODs) will receive their first vaccine during their term of service. However, due to the logistics of volunteer scheduling, this vaccination may not be given on the first day of volunteering. We are also asking for a time commitment of 36 hours from volunteers who are at the PODs to help us increase efficiency."

Licensed health care providers should register through the Medical Reserve Corps of Southern Arizona, and here is a direct link to their online application.  

Not a licensed medical professional, but still want to help?!  There is a great need for lots of other volunteers. Pima County is partnering with the Arizona Department of Health's Disaster Volunteer Registry. Click the big blue button to sign up. You do not need any medical background, and these jobs will require standing, sitting and/or walking for some period of time as well as potentially lifting, bending, and carrying things.  

Finally, you can email the county coordinators directly at [email protected] to sign up and get started.

I registered, and I will work my first shift tomorrow at the Tucson Convention Center.