Katie's neighbor Mrs. Muddle declares more holidays than anyone else, and she celebrates them in style. In March, she makes peanut-butter-and-birdseed cookies for the birds to enjoy on First Robin Day. The next month, she and Katie dance in the rain during First Shower of April. As the year goes on, Mrs. Muddle creates a unique holiday for each month, and all of Katie's friends get in on the fun. Then Katie comes up with a special holiday of her own, and Mrs. Muddle Day is the biggest celebration her neighborhood has ever seen!

The particular joys of each season are brought to life in lively, entertaining watercolor-and-ink illustrations by Thomas F. Yezerski.