I saw an article referring to Friendsgiving as made up, and oh here I go. For five years I tweeted (twote?) silly holidays every morning and so of course I looked into who made up some of them. (I talked a little about that before.)
And first, all holidays are made up. There are no organically grown holidays. They all got plunked down somewhere, decreed by someone with or without authority. But if you think I am going to eschew celebrating Ice Cream for Breakfast Day just because nobody gets the day off work, you would be wrong. (Also, many people, including the nice people at the ice cream place, work holidays. So let's also stop pretending "everyone" gets holidays off.)
Second, Thanksgiving is also made up. It commemorates an event, sure. But there are four US states that claim the first Thanksgiving discussion was held in their state. It's current placement on the calendar was literally determined as a way to boost people starting Xmas shopping early.
And honestly Friendsgiving shouldn't need a name. It does because weirdoes who don't understand why you would want to share a meal with someone you aren't related to or planning to marry. But people do because jobs, travel, or family being not great. (Allegedly.)
Gathering with friends, with community is a way to celebrate the supposed mythology of the holiday, the gathering and sharing of fall and winter foods. You can do that with family also. But the family you make counts to, whether or not you are bound by blood or legalities.