The Serbian Orthodox Church Municipality of Kotor informs about the services on the feast of the Annunciation (Sunday of the Cross) on April 7:

On Sunday, April 7, in the Church of St. Vasilija Ostroški in Dobrota, the Holy Liturgy will begin at 8 am.
On Sunday, April 7, in the Church of St. Spyridon in the Old Town, the Holy Liturgy will begin at 8 am.
On Sunday, April 7, in the Church of St. Luke in the Old Town, the Holy Liturgy will begin at 10 a.m.