Easter Is the Most Important Holiday on the Christian Calendar and Has Been Regularly Observed from the Earliest Days of the Church.Easter Always Falls on a Sunday Between 22 March and 25 April Inclusive, Within About Seven Days After the Astronomical Full Moon. Download Easter Holiday Stickers for iMessage. How to Use: - Open iMessage from your iPhone. - Click on the Appstore icon for sending stickers. - Select the WaterColor Greetings Sticker app . - Just with a single tap send stickers. - Also simply long touch and peel off the stickers to add them with your texts!!