Freeze grapes in clusters as purchased. This is not a girl's-only punch; it's a hit with men too.
Place grapes in a zip-top plastic freezer bag; seal bag. (Do not remove grapes from stems.) Freeze completely (about 4 hours).
Gently stir together grape juice and lemonade concentrate in a large pitcher. Add frozen grapes to pitcher. Serve immediately.
Note: Grapes may be stored in freezer up to 1 week. For photography we doubled the recipe.
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