If your sweet tooth also has a spicy streak, mark your calendar for July 19. Morgenstern’s Finest Ice Cream is teaming up with New Orleans legend Crystal Hot Sauce for a scorching summer sundae collab—and for two glorious days, they’re giving it away for free. The sundae will be available for purchase at Morgenstern’s starting Saturday, July 19, for one week only. But if you’re smart (and punctual), you’ll snag it for free: The first 150 guests in line at noon on Saturday, July 19, and again on Sunday, July 20, will get the sundae gratis, along with a limited-edition Crystal x Morgenstern’s cap to complete the lewk.

• Morgenstern's x Crystal Hot Sauce Free Sundae Details