Would you have a late 80s great-grandmother outside in the cold? Its 30F right now and I'm not even in a cold part of the country. I got some buddies out in the mid-west that are in 0F weather and -20F wind chill.

Realistically speaking, the party is going to be at a house of one of her children, or grand-children.

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An "outdoor" party these days is a closed tent anyway with heaters. Its practically an indoor party with the same air-flow issues except much much more expensive. Do you think I haven't looked into this?