They told Ted Cutler not to do it this summer, that there simply wasn’t enough time to launch what he’s calling the biggest arts and music festival in Boston’s history.

Others warned the Dorchester-born millionaire that holding the Outside the Box festival could cost him more than $5 million.

But Cutler didn’t listen.

“I’m going to be 83 years old,” he said, chuckling. “I don’t buy green bananas, for Christ’s sake. I want this to happen when I’ve got a couple of years to enjoy it.”

Outside the Box, running July 13-21 on the Boston Common and City Hall Plaza, is a huge undertaking, promising more than 200 musicians and other performers. What’s more, it’s all free to the public.

But the tab, for Cutler, could be considerable. Full story for BostonGlobe.com subscribers.

Geoff Edgers can be reached at gedgers@globe.com.

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