We just learned about Palm Sunday.
The next day in the church calendar is Maundy Thursday.
This day is to remember the Last Supper, when Christ sat with his disciples for the last time, washed their feet and then ate together.
Some churches remember the day by having foot washing ceremonies where everyone washes each other's feet.
(from: wikipedia - maundy thursday)
Kid Facts - Blast from the past: Jesus' Burial