In addition to the Blessed Mother, other saints are observed in the liturgical year. This is as good a summary as I’ve seen explaining the Catholic regard for martyrs and saints, tying it all in to Christ and his Paschal Mystery and our redemption:
The Church has also included in the annual cycle days devoted to the memory of the martyrs and the other saints. Raised up to perfection by the manifold grace of God, and already in possession of eternal salvation, they sing God’s perfect praise in heaven and offer prayers for us. By celebrating the passage of these saints from earth to heaven the Church proclaims the paschal mystery achieved in the saints who have suffered and been glorified with Christ; she proposes them to the faithful as examples drawing all to the Father through Christ, and through their merits she pleads for God’s favors.