Naps while out?

So I'm planning on going to a bbq with some close friends in a few weeks and bring my 8 month old. The problem is.. I'm worried about how she will nap, or where, to be precise. My little one is currently on a pretty regular schedule and we always do the same routine, book, dark curtains, sound machine, sleep sack and then soother and she always falls asleep on her own in like 2 mins. She won't really fall asleep anywhere else.. But now she will have to nap at the bbq somewhere. None of my friends have kids so they don't have a safe area for her to sleep. I was thinking I could bring her playpen and try to get her to sleep there but I would have to wait inside and listen for her when she wakes up I guess.. Do you think that's overkill? How would u guys handle this situation? If we skip her afternoon nap she is going to be crazy cranky 😵