Moveable feast

A moveable feast is like a special meal that changes its date every year. It's a feast or celebration that is linked to a certain event or holiday, but the exact day that it happens changes from year to year.

For example, Easter is a moveable feast because it doesn't have a set date. It's celebrated on the first Sunday after the first full moon after March 21st. So, the date of Easter changes every year because it depends on when the full moon and March 21st falls.

Another example is Ramadan, which is an important time for Muslims to fast and pray. Ramadan is a moveable feast because it's based on the Islamic lunar calendar. So, Ramadan falls on different dates every year.

Overall, a moveable feast is a special occasion that is celebrated annually, but its date changes depending on the rules or principles governing its occurrence.