participation was open to anyone who voted in the primary, whether they voted early, as an absentee, or on the day of the primary. participants had to sign in and provide proof that they voted in the primary. such proof could be provided in one of several ways: showing a registration card that was stamped at the primary, producing an early voting receipt, providing an official photo identification that can be checked against a roll of early voters, or signing an affidavit (oath). texas democratic precinct conventions are governed by robert's rules of order and texas democratic party rules. participants arriving late to the convention could still participate but could not affect any voting that had already taken place.