https://www.elections.virginia.gov/casting-a-ballot/calendars-schedules/
The link above takes you to the calendar on the Department of Elections website, it includes deadlines for voters, candidates, etc. This may be updated as emergency or legislative changes are made so I suggest checking on it periodically.
As elections get closer we recommend checking our VOTE411.org for your sample ballot information. If you are interested in helping to collect the information email support@lwv-rva.org to get involved!