As a corporate communicator, I've stumbled across and corrected this more often than you can imagine. Executives want to sound eloquent and authoritative in their messaging to their reports. Newsletter writers want to sound interesting and knowledgeable. They brave the use of compound modifiers to exert their writing mastery but fail sophistication by following adverbs ending in "ly" with a hyphen.
According to The Chicago Manual of Style and other writing manuals, compound modifiers before a noun are not hyphenated when they are proper nouns or compounds formed by an adverb ending in ly.
Compound modifiers, or phrasal adjectives, are hyphenated for readability and clarity. However, this is unnecessary with adverbs ending in ly. As stated in The Chicago Manual of Style, "the ly ending with adverbs signals to the reader that the next word will be another modifier, not a noun."
So, kid-friendly and family-oriented events should be hyphenated, but you'll never have a smartly dressed novel with a hyphen. Make sense?