The liturgical year is know to all Christians and there are 3 colours. Green, purple and yellow or white.
Green is ordinary time. This is a time where there is not much liturgical events. Purple is lent and advent. These are time's before a important liturgical event happens. Yellow (Or white) is Easter, Pentecost, and Christmas. These are important liturgical events that involve Jesus.
Here is a google drawing of the Liturgical calendar.