"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Now that your head is swimming with ideas, check out the DIY mermaid Halloween costumes we've curated ...

MEET A LIVE MERMAID: The mermaid meet-and-greets are among the most popular events on the Mermaid Month schedule, and in 2025 those will raise a sunny splash on both March 8 and March 22. Various ...