Katie is sure her neighbors on Maple Street celebrate every holiday in existence, from Ramadan to Pioneer Day, until Mrs. Muddle moves in. One March day, Katie finds Mrs. Muddle hanging yarn from a tree in celebration of the appearance of the first robin, and Katie asks if she can help. Mrs. Muddle introduces Katie and an ever more multicultural group of friends to a new holiday each month, from Earth Worm Appreciation Day in May to Let’s Pretend It’s Summer Day the following February. After a year, the kids are looking forward to a second year of Mrs. Muddle’s holidays, but Katie gets the whole neighborhood to surprise Mrs. Muddle with a holiday of her own. Nielsen’s maiden voyage is a holiday winner, and Yezerski’s pen-and-ink watercolors are bright, warm and festive. This is perfect for every collection, especially those serving elementary schools. (Picture book. 5-9)