1 Corinthians 11:26, Looks like Christendom as it right, not the Witnesses. The Gospel is presented through the service of Communion ( bread and wine ) as the elements are explained, they point to his physical incarnation, sacrificial death, resurrection, and coming Kingdom.
So, Holy Communion is taken often at Mass until the Second Coming, which has not happened yet according to Christendom.
As to the Watchtower, they say he came in 1914, so why are they still having Mass, their Memorial?
Blueblades