Easter commemorates the resurrection of Jesus after his crucifixion. It is a moveable feast that does not fall on a fixed date, as it is based on a lunar calendar. The week before Easter includes Palm Sunday, Maundy Thursday commemorating the Last Supper, and Good Friday commemorating Jesus' crucifixion. Traditions vary by country but include Easter eggs, which may have merged into celebrations from the end of Lent's privations. In 2011, the Easter dates matched for both Western and Eastern Christian churches.