What are these in transliterated Greek and Russian? My Slavonic guesses may be wrong.
Transfiguration
Christ is Transfigured! - On Mount Tabor!
Pascha
Christos Voskrese! - Voistinu Voskrese!
Christ is Risen! - Indeed He is Risen!
Pentecost
Christ is Among Us! - He is and Shall Be!
Nativity
Christos Razdajestsja!- Slavite Jeho!
Christ is Born! - Glorify Him!
Theophany
Christ is Baptised! - In the Jordan!
Remainder of the Year
Slava Isusu Christu! - Slava i Na Viki!
Glory to Jesus Christ! - Glory to Him Forever!
Praised be Jesus Christ! - Praise Him Forever!