Solemnity Of The Immaculate Conception 2024 Calendar. The solemnity of the immaculate conception celebrates the immaculate conception of the blessed virgin mary on 8 december, nine months before the feast of the nativity of. This year, the solemnity of the immaculate conception of the blessed virgin mary is celebrated on monday, dec.
Patronal feastday of the united states of america note: 9 this year because dec.