Cathedral of Saint Peter issued the following announcement on Oct. 18

Mass CelebraƟng World Mission Sunday A Pontifical Mass celebrating World Mission Sunday will be held on Sunday, October 25, at 12:15 p.m. Bishop Joseph C. Bambera will be the principal celebrant. Reverend Brian J. T. Clarke, Diocesan Director of the Pontifical Mission Societies, will concelebrate. The homilist will be Reverend Jamie Perez. CTV: Catholic Television will broadcast the Mass.

Original source can be found here.