Alabama state legislative special elections, 2021
From Ballotpedia
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Senate special elections called:
How vacancies are filled in Alabama
If there is a vacancy in the Alabama State Legislature, a special election must generally be conducted in order to fill the vacant seat. In the event that a vacancy occurs on or after October 1 in the year of a regular election, the seat will remain vacant until filled at the regular election. Otherwise, the governor must call for a special election if the vacancy happens before the next scheduled general election and the Legislature is in session.