In the early 1970s St. Francis de Sales Cathedral (Oakland, Ca) and First Baptist Church of Oakland participated in pulpit exchanges around Reformation Sunday.  On one Sunday the cathedral would assemble there and then march to FB for a joint service.  Both choirs sang representative hymns and the pastor of SFdeS would give the homily.  Then a Sunday or two later, the reverse would happen and FB would join the Catholics, with their pastor preaching.   These were some of the very best attended services of both congregations.

Long ago, far away, never repeated once the 1989 earthquake destroyed the Cathedral and the parish dispersed.