Why not organise a poetry Assembly where each student has to recite a poem from memory. You could have a theme for the poems or leave the choice entirely up to each student. Funny poems always go down well with the audience.
Here’s a poem to get you started.
I Taught My Cat to Clean My Room
A Funny Cat Poem for Kids
by Kenn Nesbitt
I taught my cat to clean my room, to use a bucket, brush and broom, to dust my books and picture frames, and pick up all my toys and games. He puts my pants and shirts away, and makes my bed, and I should say it seems to me it's only fair he puts away my underwear. In fact, I think he's got it made. I'm not too happy with our trade. He may pick up my shoes and socks, but I clean out his litterbox.
All My Great Excuses
A Funny School Poem for Kids
by Kenn Nesbitt
I started on my homework but my pen ran out of ink. My hamster ate my homework. My computer's on the blink. I accidentally dropped it in the soup my mom was cooking. My brother flushed it down the toilet when I wasn't looking. My mother ran my homework through the washer and the dryer. An airplane crashed into our house. My homework caught on fire. Tornadoes blew my notes away. Volcanoes struck our town. My notes were taken hostage by an evil killer clown. Some aliens abducted me. I had a shark attack. A pirate swiped my homework and refused to give it back. I worked on these excuses so darned long my teacher said, "I think you'll find it's easier to do the work instead."