If you need to use an app to manage your parties, it's a networking event. Which isn't unheard of in higher layers of society I suppose.

You can network without an app or a permanent digital record.

We threw epic parties for ~80 to 100 people every month for five years back in the student days, in a massive cheap rental house scheduled (along with a 120 others) for demolition for road widening for a major North-South throughway.

It was high on a hill (now a cutting), colonial gilded age "beach house" with a view to the ocean ... and I suspect a great many of the people that passed through can happily live without a record of their debauchery now some decades have passed.

Networking-wise, it was a trove, numerous marriages and business partnerships launched, a few dashed on the rocks, still remembered fondly as a point of reference by a crowd now scattered across the globe.

Huh, are all social gatherings not networking events by definition?

Where I'm from it's quite normal to create a facebook event.