Once the missionaries had left the village they tried to return after a while to stoke up the fires of enthusiasm once again:
The missionaries will return to the place where they gave a mission four or five months later to give several spiritual exercises, but the return must be shorter than the mission, and there will be fewer missionaries. In this way they will solidify the benefits produced by the mission.
1818 Rule Part 1, Chapter 2, §1, Article 12
These visits were seemingly not done in an organised manner, but they did happen whenever possible
Sevrin describes the return of missions as aiming at ascertaining whether the
impressions made and the resolutions taken had suffered any decrease, whether converts had persevered, whether Easter duties had been fulfilled, whether Sundays were being properly observed, whether dance halls and cabarets had recaptured their clienteles, whether peace and unity still reigned, and finally, what was very important, whether pious and charitable organizations remained steady and fervent.
SEVRIN, Les missions, I, p. 341.