Go to my truck and bring in the emergency box.
Since it's a blizzard I have my snow gear in there too, so I would have multiple layers, and pairs of socks and a pair of boots.
Emergency box would have mountain house food to share.

Then I would do what blast said and find out what skills everyone may have that could come in handy.

Other ppl seem to have covered a lot of it after that... insulation, other food sources, water sources/melting, first aid kits, morale boosters / hot water, comm gear, heat source / fire if possible, snow gear, put a flag or some signage up to let ppl know you are there.

Make sure if the snow is continuing it is not blocking you in 100% and cutting off your oxygen.

This post reminds me once again I have a lot to do to prepare for winter still!