The closest official thing in the US is Labor Day in September. Most people forget it is a workers rights day, though.

From Wikipedia:

More than 150 other countries celebrate International Workers’ Day on May 1, the European holiday of May Day. May Day was chosen by the Second International of socialist and communist parties to commemorate the general labor strike in the United States and events leading to the Haymarket affair, which occurred in Chicago, Illinois, from May 1 – May 4, 1886.

I have neighsal congestion and now my throat is feeling a little horse!

Try to come across friendly without sounding condescending.

First, empathize (I know those things can be tricky, it took me a minute the first time), then offer to help without judgement (I have some experience with these, would you like me to try?), then back off if they say no.

If they refuse help, you’ve done what you can, end of story. Don’t be pushy.

Key point here is to be nice about it. Don’t call them out or make them feel dumb. Don’t judge. You don’t know why they’re not getting it, and next time maybe it is you who is “dumb”.

Also, don’t expect everyone to share your intellect (it’s obvious to you) or curiosity (you want to know how it works). Most people just want their problem fixed and move on.

They can and do try to share malware, but distros and software hubs take measures to prevent it. You can read about Flathub’s approach in Flathub Safety: A Layered Approach from Source to User