Here's the prayer for Lewis' day from Holy Women, Holy Men, the Episcopal Church's Calendar of commemorations:
O God of searing truth and surpassing beauty, we give you thanks for Clive Staples Lewis, whose sanctified imagination lights fires of faith in young and old alike. Surprise us also with your joy and draw us into that new and abundant life which is ours in Christ Jesus, who lives and reigns with you and the Holy Spirit, one God, now and for ever. Amen.
More about Lewis posted at NPA on Facebook.