Check out the Birthday Express Ideas Blog for all of the best ideas on themes, decorations, food, activities and more. Expert tips are available for every step of the. Looking for tips and ideas about games and party favors for a carnival or circus birthday party? I threw a party with a carnival / circus theme for. Ladies and gentlemen and children of all ages will love a circus theme party, prom or formal created with supplies, props and decorations. Circus Party Ideas For Adults.