For the most part, Passover is not about us: It is a solemn assembly to remember Jesus Christ and what He has done for us in laying down His life.
Looking back to past events is profitable. Some things people choose to remember are trifling, but the things God commands us to remember are always important.
God asks that we use the Passover to bring to remembrance His redemptive act, especially how our sins caused Christ to die in our stead.
'Advent' can refer both to Christ's first coming as a human being or to His second coming in overwhelming power and glory to establish the Kingdom of God on earth.