Conversation so far:
when did the nba start using 3 referees
The NBA adopted the three-official system used in college basketball permanently during the 1988-89 season.
did the nba ever use three officials before the 1988-89 season
The NBA experimented with three officials per game in the 1978–79 season.
are there any female officials in the nba
Violet Palmer and Dee Kantner became the first two female officials in NBA history during the 1997–98 season.
who was the first female official to officiate an nba playoff game
Violet Palmer was the first woman to officiate an NBA playoff game.

Question: when
Self-contained rewrite: when did violet palmer become the first woman to officiate an nba playoff game