The superior of the mission was the one responsible for the smooth-running of all the activities and to ensure that they achieved their objectives. He could be regarded as a type of master-of-ceremonies, and used the time of the announcements as an important way to ensure this.
In the Ceremonial for Missions, Eugene gave an indication of the contact and human feeling he tried to convey through the avis:
The avis must be lively and interesting. It would not be advisable to give them always by way of reproach. It is even good, according to the days, to make them a little bit cheerful. But one must be very careful not to fall into buffoonery or trivial jokes: this is difficult, if the one who gives them is not skilled in good-humoured banter nor have a good knowledge of what is proper. In that case, it is infinitely better to keep the tone serious; but one should never scold, even when it is necessary to make some reprimands.
Cérémonial pour les Missions, Missions OMI, vol 78, n.276