When God commanded his people to camp and party and remember

Life can be terrifyingly fragile. Especially if you're in a place where all your comfort and security have been removed and you don't know where your next meal is coming from. But when things get better we can forget that fragility and our need for God.  God knows that about us. So he put in the calendar of his people one week a year where he commanded his people to camp and to party and to remember...