Things must have changed since you attended in '68.
As long as I have been involved with the Episcopal Church (mine is Anglo-Catholic), it has practiced "open Communion", meaning that ALL baptised Christians may receive the Sacrament.
I was Baptist at the time, and had been invited by a friend, who is now an Episcopal priest.
As a former Lay Eucharistic Minister, I have offered Communion to the Baptist friends and relatives of folks I went to the hospital to visit and take Communion to. More often than not, they accepted it. It's funny how having a loved one in the hospital in serious condition tends to break down our petty,self imposed denominational barriers.
I realized after a short while that I had to start "warning" folks, though. I soon became aware that many were shocked when I served them the Cup... and they realized that it did NOT contain Welch's Grape Juice. LOL.
By then I had moved out of the Bay Area, to an area decidedly Fundamentalist, and my friend had been ordained, and went to Papua.
Currently, our neighbor (we sold them their 20 acres) is the Anglican priest for the local Anglican Mission in America, but has never invited us to services, and avoids discussing religion...but did he bless our animals one year. And, yes, we do socialize; they even share part of our garden area.