For younger kids that don't really sit for circletime remember that it doesn't all have to be done in a block of time. Spend 5 minutes reading a story and then singing a song or doing a fingerplay related to the story then send them off to play again. Later call them all to the feltboard for some rhymes and then send them off to play again, set up a group game and then gather everyone to play. A circletime done in 4x5 minute segments has more meaning than a 20 minute block to the little ones. I tend to do a concept at each one so one session might be reading a story about insects and then singing itsy bitsy spider with actions, another would be a shape matching file folder game but me supervised so no one chews on the pieces, another session would be at the feltboard doing counting, sorting, matching, a short story, etc. I look for opportunities to do the "lesson" where they are playing so learning the skill of sorting/matching one to one correspondance can be done in the kitchen area making sure there is a matching cup for each saucer or dividing up a board into rectangles and making sure there is a hot wheels car parked in each spot. We count the cars, name their colours, decide which row has the most cars in it. All of the same skills we would be trying to teach in a formal sit down circletime but they are learned in the middle of play instead.