AIBU to think smart shorts are fine for a graduation in heat?

[LifeIsGreatForUnicorns]

Tuesday is my son’s graduation. It’s in London so supposed to be 33C. We’ve been told that it’s in a marquee so bring a fan if possible. We are obviously only guests so will be sitting with the 100’s of other parents there.
I’ve changed my outfit to a summer floaty maxi dress as original outfit was a heavier material .

DH was originally going to wear smart jeans, shoes, pale blue cotton shirt and smart blazer. With the heat, he’s going to be miserable and hot!

Would it be appropriate for him to wear a smart short sleeved shirt and shorts and he’s got a pair of deck style shoes.
He says smart shorts are not ok!

POLL:
YABU - no it’s a posh event so wear the blazer 🥵
YANBU - it’s too hot so shorts and a smart shirt are fine 😎

😂

@LifeIsGreatForUnicorns if it's a university in North London then expect that marquee to feel like 40 degrees.

I can honestly say I don't remember noticing what anyone else was wearing at either of my children's graduations. Nor can I
remember what I wore. The other parents were just a blur of faces, seated in a fuggy, tightly packed ancient hall and cathedral respectively, for far too long. Dress to be comfortable. No one is there to look at you.

Even in Aus where dress codes are pretty relaxed there is no way DH would wear shorts to a graduation and he has plenty you would probably classify as smart shorts. Lightweight chinos and short sleeve shirts cover most events.

YABU unless they are elegant, fashionable and formal. Not jeans either. (I go to graduations regularly) Casual lightweight trousers and a shirt. Or an elegant skirt, kilt or culottes if he likes.