(in elections for village committees in the PRC since the 1990s) unrestricted nomination, a type of election where 1. everyone in the community is eligible to nominate somebody 2. voting is done by writing the name of one's nominee on the ballot, and 3. one's nominee can be anyone in the community (Nominees who receive the highest number of votes may be thereby elected or, more often, presented as the candidates in a further round of voting.)

(in other contexts) selection of the best contender in a process open to all comers

(in the entertainment industry) open audition