Hi Pete, Being carefree and young in the 70's I have the greatest memories of with vinyls. The younger generations are not so much in the know but just think what the have missed out on. Making one day a vinyl day is a great idea. We have a small recored player with a box full of vinyls and enjoy playing them now and again too.
TBH, vinyl is making a bit of a comeback; look in your local supermarket. Most have a vinyl stand these days. I get that vinyl is bulky and an old technology, BUT! There's something tactile about holding and playing a record. I don't care what any expert says. Vinyl sounds and feels warmer, and mp3's on your phone doesn't come with song sheets and artwork booklets.