Monroe. Bug on a Bike

Bug on a Bike is a children's book by Chris Monroe, with art by the author, published in 2014. It is not available at the Internet Archive. 

Here's a YouTube read-along.

The story is told in rhyme, and it tells how the bug (who has no name) goes to get Lizard Mike, Randy the Toad, ants on a log, Butterfly Andy, a polka-dot dog, a pickle, a scruffy orange cat, a nickel, and a chimp in a hat. Next they meet Skater Bunny, a bear with some honey, a mouse, a snake in a blouse... and there's more: a herd, a red bird, three wild billy goats, carpenter clams (who were "building wheels for their boats"... you can hear how the rhymes are piling up!). The crowd fully assembly consists of: the clams in their boats, and the three billy goats, the flying red bird, the thundering herd, the snake in her blouse, the little gray mouse, the bear and his honey, the skateboarding bunny, the chimp in the hat, the scruffy orange cat, the athletic pickle, the shiny round nickel, the polka-dot dog, the ants on the log, and Butterfly Andy with hoppy toad Randy... all followed Mike and the bug, on a bike!"

As you can see, it is quite adorable. None of them, except the bug, know where they are going! I won't give it all away, but it involves festivities, so all the animals get to know do something at the party, and you get another iteration of all the characters; for example: "And the snake in her blouse, with the cake-eating mouse drank blue bubble tea in a blue bouncy house," etc. 

No, it's not much of a plot, but that doesn't matter because the rhymes are charming, and so are the illustrations, which show each of the characters as they join the group, make their journey, and have fun at the party. It's not exactly cumulative because as the characters join the group, you do not get a cumulative narration, but you did get a listing of all the characters once the group is complete, and then you get a listing of all the characters once again at the party, so I'll call it quasi-cumulative.

This would be a great book for children to imitate by writing their own rhyming-party story. My guess is that the author started with the list of characters that I quoted above, and then wrote backwards and forwards from that list: backwards to enumerate the characters as they join the group, and then forwards as they make the journey together and then enjoy the party.

It's all quite delightful, and easily imitate-able.