Fake snakes and weird wizards

"Hank's sister Emily wants Ralph's Reptile Show to perform at her birthday party more than anything, but Ralph is booked solid. So Hank comes up with a plan: he'll disguise himself as a magician called The Westside Wizard and pull a snake from thin air! But when Hank's true identity is revealed during his performance, his good deed might just turn into a huge disaster"--

Hank disguises himself as a master magician when his sister's performer of choice is unavailable for her birthday party. He is exposed during his performance, with catastrophic results. The coauthor is Lin Oliver. Book #4