Definition…

Horned Lark
Lark: A ground-dwelling songbird known for their melodious singing in flight—unlike other birds, who only sing when perched.
Kelvy and Alfredo
Lark: A source of, or quest for amusement or adventure; to engage in harmless fun or mischief. –Merriam-Webster dictionary
Collective: People coming together in a cooperative way—in this case, to learn, to grow.