Get Roon. Get Tidal (or spotify or whatever). Get a cheap tablet like a Fire. Throw a party, invite people to brunch, coffee. Pass the tablet around so people can pick music they like. Did this all last summer and expanded my collection massively. For example, somehow I had forgotten of the existence of Massive Attack, while I was playing something else (Vangelis perhaps) my brother took the tablet, found and played Teardrop. Haven't stopped listening to it since.

During parties, rarely are people upset with the choice of whoever has their hands on the tablet, but very often delighted by new things or reminded of old things.