We attended "An Elizabethan Festival" given by the Washington Revels ("Celebrating tradition through music, dance and drama") this morning.  If you like this sort of thing, you'll love the Revels.  Leo and Milly were enraptured.  Their favorite part was the mummers' play of Saint George and the Dragon; so we read this classic edition, retold by Margaret Hodges and illustrated by Trina Schart Hyman (Little, Brown; 1984), when we got home.  Hodges's text, adapted from Edmund Spenser's Faerie Queene, is lovely but a little wordy (can you blame her?).  Hyman's illustrations, however, are magnificent.  This book won the Caldecott in 1985.

I'm still looking for a picture book about Saint George and the Dragon that captures the comic feel of the mummers' play, though.  Any suggestions?

[Updated to add:  Many thanks to Debbie of the Washington Revels, who commented with a link (scroll down) to Saint George and the Dragon:  A Mummer's Play by Revels founder John Langstaff with woodcuts by David Gentleman (Atheneum, 1973; OOP but available at the Revels Store).  It includes the script with music, instructions for performing the sword dance (look out, Milly!), stage directions and costume suggestions.  In short, exactly what I was looking for.  Thanks again!]