Hello InTheSpotlight,
As an ex JW of over 30 years who is now a Christian, I have a word of advice.
I see no harm wanting to go and observe how they do their Memorial service. If it will help you have a better understanding of them, then do it.
As a Christian, I would take the emblems because of what they represent.
If you are wanting a ministry of reaching out to Jehovah's Witnesses with the real truth, that is a good goal to have in your heart. However, you would be wasting 99.99% of this time that could be put to use in a more meaningful ministry. There are hundreds of them!
Trying to talk to or convince an active Jehovah's Witness into believing that there is a "crack" in their belief system is a futile undertaking. The only way for a JW to become an ex JW is by their own doubts and investigating them and the entire religion.
But if you plant even one seed, it could grow into something fruitful.
I wish you the best.
HappyDad