Ember Days are days favored for priestly ordinations, prayer for priests, first Communions, almsgiving and other penitential and charitable acts, and prayer for the souls in Purgatory. ~Fish Eaters
Since the late 5th century, the Ember Days were also the preferred dates for ordination of priests. So during these times the Church had a threefold focus: (1) sanctifying each new season by turning to God through prayer, fasting and almsgiving; (2) giving thanks to God for the various harvests of each season; and (3) praying for the newly ordained and for future vocations to the priesthood and religious life. ~Catholic Culture
Alas, the holy seasons of the Ember Days, which recur four times a year at the beginning of spring, summer, fall and winter, are no longer observed as they were in the old Church, namely as days of ordination of our priests when the Church wants her faithful to remember her priests by prayer and sacrifice. Nowadays, we have "Priest's Saturday," which takes, somewhat, the place of those very holy seasons. Ember Saturday, which was the day of the final ordinations, is the day when we might explain the sacrament of Holy Orders to the children. On the evenings of these Saturdays, after preparation for the Mass, we could tell them about the holiness of priesthood and sisterhood, about our Holy Father, the Pope, about the cardinals and bishops, and particularly about our own bishop — our true representative of Christ. We could remind them to remember the Pope, the bishop, and all the priests in their daily prayers. If it is at all possible, we might have them participate in the yearly ordination ceremonies, a great liturgical experience.
Activity Source: Around the Year with the Trapp Family by Maria Augusta Trapp, Pantheon Books Inc., New York, New York, 1955