I just ran into these verses, they make the clear case against the WT and an explicit rebuttal of "the Memorial".
Colossians 2:16-23 (New International Version)
16 Therefore do not let anyone judge you by what you eat or drink, or with regard to a religious festival, a New Moon celebration or a Sabbath day. 17 These are a shadow of the things that were to come; the reality, however, is found in Christ. 18 Do not let anyone who delights in false humility and the worship of angels disqualify you for the prize. Such a person goes into great detail about what he has seen, and his unspiritual mind puffs him up with idle notions. 19 He has lost connection with the Head, from whom the whole body, supported and held together by its ligaments and sinews, grows as God causes it to grow.
20 Since you died with Christ to the basic principles of this world, why, as though you still belonged to it, do you submit to its rules: 21 "Do not handle! Do not taste! Do not touch!"? 22 These are all destined to perish with use, because they are based on human commands and teachings. 23 Such regulations indeed have an appearance of wisdom, with their self-imposed worship, their false humility and their harsh treatment of the body, but they lack any value in restraining sensual indulgence.
Verse 8 sums it up and 9 & 10 are pure gems :)
Colossians 2:8-10 (New International Version)
8 See to it that no one takes you captive through hollow and deceptive philosophy, which depends on human tradition and the basic principles of this world rather than on Christ.
9 For in Christ all the fullness of the Deity lives in bodily form, 10 and you have been given fullness in Christ, who is the head over every power and authority.
Blessings,
Stephen