The Parish to which I belong is dedicated to the Patronage of a Saint Gianna Beretta Molla (April 28) and the Parish Church (brick and mortar) is dedicated to Saint Bernadette Soubirous (April 16). Canon Law prohibits changing the name of a church once it is dedicated to a specific saint, etc. However, in the current U.S.A. Ordo, Saint Gianna is not yet listed and St. Bernadette is only mentioned in the Ordo for February 11 (Our Lady of Lourdes) with no option of celebrating her feast on April 16. (Perhaps that is because in 2013 April 16 fell within the Easter Season). If this parish wishes to honor their patronesses on the dates of their feasts what options do they have? I can understand if these dates were on a Sunday, but in the future, may the option for celebrating the Mass for A Holy Woman be used for Saint Gianna and the option for a Religious be used for Saint Bernadette?
You will find at the beginning of the Roman Missal a table of liturgical days (also here).
This should tells us all we need to know.
Regardless of whether a particular saint is on the General Calendar, or the Particular Calendar of a nation or a diocese, if a parish is dedicated to that saint, his or her feast is “on the calendar” for that parish.
A helpful guide is HERE.
Unless 28 April or 16 April fall on a higher-ranked celebration (such as Easter or Ascension), the parish celebrates its titular feast day and the titular feast day of the parish church. Patronal/titular feasts are ranked as solemnities, but proper solemnities rather than solemnities such as the important feasts of the Lord or Our Blessed Mother and so forth. So, we should give proper liturgical observance to the patron of the place, the titular patron saint of the church and also the anniversary of the dedication of the church building.
If the pastor wants to transfer the celebration to a Sunday of Ordinary Time, he should consult with the local bishop about the praxis of the diocese. The local diocesan bishop can grant permission (and this is fairly common, I think) to transfer the celebration.