How are employees notified that there is going to be an election?

The Regional Director issues a Notice of Election.  This Notice is posted by the activity/agency in places where notices are customarily posted and distributed in a manner by which notices are normally distributed.  The notice describes the election procedures -- the appropriate unit, the eligibility period, dates and hours and locations of the election, a sample ballot, and the effect of the vote.  See Section 2422.23(b) of the Regulations.