I would be walking from a car into a function room where I would be mostly sitting down.
You asked for advice/opinions and thats what I gave FlyingHandbags. If you've already made up your mind to wear high heels, what was the point of asking for our thought on the matter? You've already fallen down stairs, had walls collapse on top of you, been unable to get up off a floor due to physical instability but, if you want to wear high heels to an event; do it. But please make sure that the "family gathering" is done in line with current advice on social distancing and that you don't slip up again. That would spoils things, wouldn't it?