At the risk of sounding a little preachy, the first thing we can do to celebrate this and every Sunday is go to Mass. What better way is there to learn about Jesus being with us than to experience it first hand? Many aspects of our faith are not passed on by learning about them, but by living them, and we should help our kids do this is at Sunday Mass. I like our parish's family Mass, since screaming kids are not a problem!
The other thing my family will do is a tradition I started last year. I got the idea from Lacy's Trinity Sunday Sundaes over on Catholic Icing. She has wonderful Catholic ideas and activities, and you can find her 'Trinity Sundae' post here.
The basic idea is to make a representative 'sundae' on the 'Sunday' of the feast! This is what I did for the Body and Blood of Christ:
Ingredients:
Purple-ish ice cream or sherbet (I used black cherry) to represent the wine that becomes Jesus's blood.
Round cookie wafers to represent the bread that becomes Jesus's body.
Whipped cream, where the white, fluffy cream reminds us that Jesus was a pure and innocent sacrifice for our sins.
Red colored sugar or sprinkles to represent Jesus's blood.
Put together as you would any sundae in a stemmed serving dish (the stemmed dish represents the chalice, which is the cup used to hold the wine that becomes Jesus's blood at Mass.) As you eat, talk to your children about the meaning behind Corpus Christi Sunday Sundaes. Enjoy!