Ember Days are also the time requited by the canons for postulants to write to their diocesan.
The church as a whole sets aside these days to pray for the candidates. In the "olden days" ordinations only took place during Ember Tides.
Almighty God, the giver of all good gifts, who of thy divine providence hast appointed various orders in thy Church: Give thy grace, we humbly beseech thee, to all who are [now] called to any office and ministry for thy people; and so fill them with the truth of thy doctrine and clothe them with holiness of life, that they may faithfully serve before thee, to the glory of thy great Name and for the benefit of thy holy Church; through Jesus Christ our Lord, who liveth and reigneth with thee, in the unity of the Holy Spirit, one God, now and for ever. Amen.For more about the Ember Days, see this article.