Remember, you can check the full document Pashcale Solemnitatis on this site, among many on the internet.
In this section, we are reminded that Friday and Saturday are both days of fasting and abstinence. Saturday, of course, is optional. This is not a Lenten observance as such, but one pointing to Easter joy.
39. The Easter fast is sacred on the first two days of the Triduum, in which according to ancient tradition the Church fasts “because the Spouse has been taken away”. (Cf. Mk 2:19-20; Tertullian, De ieiunio 2 and 13, Corpus Christianorum II, p. 1271) Good Friday is a day of fasting and abstinence; it is also recommended that Holy Saturday be so observed, so that the Church, with uplifted and welcoming heart, be ready to celebrate the joys of the Sunday of the Resurrection. (Cf. Ceremonial of Bishops, 295; Sacrosanctum Concilium 110)
I think the observance of Saturday is an important one. Hands please, on those who follow it in whole or in part? How many pastors encourage it? Catechumenate directors?