Refers to someone who gives a presentation, lecture, or speech at a conference, seminar, or similar event.
学会の演者は最新の研究成果を発表した。
The presenter at the academic conference presented the latest research findings.
performer; actor; TV show participant
Broadly used for anyone who performs on stage, acts in a play or film, or appears as a participant on a TV show or panel.
その演者は舞台で素晴らしい演技を見せた。
The performer gave a wonderful performance on stage.
As a participant on the TV show, he appears in the studio every week.