History was made once again in Indianapolis ... as a record-setting crowd was on hand Wednesday night to watch the U.S. Olympic Team Trials -- which included a big night from swimming superstar Katie Ledecky!!
The organization announced the massive, 22,209-fan turnout at Lucas Oil Stadium ... which edged out the previous attendance record set on the first day of the event -- 20,689 spectators.
Those fans had the privilege of watching the GOAT of women's swimming do her thing. The 27-year-old dominated, per usual .