Because the midpoint of Lent is the Thursday of the third week of Lent, Laetare Sunday has traditionally been viewed as a day of celebration, on which the austerity of Lent is briefly lessened. The passage from Isaiah continues, "rejoice with joy, you that have been in sorrow," and on Laetare Sunday, the purple vestments and altar cloths of Lent are set aside, and rose ones are used instead. Flowers, which are normally forbidden during Lent, may be placed on the altar. Traditionally, the organ was never played during Lent, except on Laetare Sunday.
Medieval Mothering Day