Bride wants her guests to stand for the entire duration of her outdoor Summer wedding

My friend is getting married and has a decent budget for her small-ish wedding, but can’t be bothered to organize any seating for the outdoor ceremony. As her friend and bridesmaid, how do I politely advocate for the elderly guests (and everyone else) that they should try and find some type of seating arrangement? Last year, it was 40 degrees C (104F) outside the the same week that they’re planning on getting married this year. I’m going to be standing so it doesn’t impact me really but I feel bad for everyone else.