In the First Epistle of Clement (or Clement I), there is no explicit reference to the celebration of certain days over others. Clement does mention various ceremonies and rituals of the early church such as baptism, Eucharist, and prayer, but he does not discuss any particular day or season as being more significant than others.
Similarly, in the Second Epistle of Clement (or Clement II), there is no mention of the celebration of specific days.
In the Shepherd of Hermas, there are some references to the observance of certain days, but again, there is no explicit mention of certain days being more significant than others. For example, in Vision 1.1, Hermas receives a vision in which he sees a tower being built, and is told that he must fast and pray for two days before receiving further revelations. In Vision 2.2, Hermas is instructed to fast and to abstain from all impure food for two days before writing a book of revelations.
Overall, while there are some references to the observance of specific days and seasons in early Christian writings like the Shepherd of Hermas, there is no clear indication that certain days were considered more significant than others in terms of Christian faith and practice.