In a large pitcher or punch bowl, combine the thawed lemonade concentrate and strawberry daiquiri mix (or frozen strawberries). Stir in 2 cups of cold water until well mixed.
Slowly pour in the chilled lemon-lime soda. Stir gently to combine. The soda adds bubbles, so avoid over-mixing to keep it fizzy.
Add fresh lemon slices and sliced strawberries for a festive look. Refrigerate for 30 minutes to chill and let the flavors blend.
Pour over ice into glasses and serve immediately, or keep chilled until ready to serve.