Marymass
/ˈmɛːrɪmas/(also Marymess, Marymas, Mair'mas) Now chiefly regional
noun
In Irvine, Ayrshire, Scotland: a festival held on the third Saturday after the first Monday in August, to commemorate a visit by Mary, Queen of Scots (1542–87), to the town in 1563.
Origin
Middle English (in an earlier sense). From the name of the Virgin Mary + mass.