Help - need dessert ideas for a hot day, but lots of other restrictions!

Hi folks, I have a tall ask. I'm attending a BBQ this weekend and want to bring a dessert. Here are the constraints:

• I'm vegan and the host is gluten-free
• It's supposed to be 32 degrees C (38 with humidity) so nothing frozen or with frosting
• We are travelling an hour to get there by subway, so no cooler and has to travel well
• Our a/c is broken at home so we are avoiding using the oven (so no cookies!)
• My husband is allergic to bananas and raspberries

Did I miss anything? 😅 Maybe I'm just not meant to bring a dessert this time! I was thinking of just bringing some fresh local peaches but is that weird? If anyone has any ideas for a no-bake dessert that would fit all of those things, I'd love to hear!