If you listen to WMVY 92.7 FM, you know Barbara Dacey. For the past 25 years, she has been one of well-known disc jockeys of the station. This Thursday, Sept. 16, she celebrates her quarter-century milestone with a concert at Nectar’s. Joining her at the free show and performing are John Cruz, Kate Taylor, Mike Benjamin, Johnny Hoy, Jeremy Berlin, Livingston Taylor, and other special guests. The show starts at 8 pm.