So I had the Negroni and Margarita last year, I’d say they were still enjoyable despite not being chilled. For me it was just the sugar + warmth outside that I didn’t like as much, but that’s just my own preference when it comes to sweet tasting things in the heat.
I’d say a couple were drinkable at a warm temp but then you might be itching for a soft drink or something chilled to mix them with, so you feel like you’re getting your money’s worth. I’m bringing the French75’s this year and hoping to mix with lemonade in my chilly’s bottle.