Even as a witness I could never understand why the memorial was actively promoted and advertised as a public meeting where anyone and everyone was invited to come. I would consider it the most baffling of all the JW meetings and certainly the most alienating in terms of feeling a part of it.
There is no scripture that says Jesus went out and invited as many silent onlookers as he could manage to get to to the last supper.
We would call it a "celebration" - it's not, it's an uptight hear a pin drop boring ceremony/ritual.
It's advertised as a "meal" - it's not, food and wine are offered but you are not supposed to accept.
They act like it's supposed to be some kind of sacred cow meeting when nothing actually happens.
So why make it open?
Then it occured to me that if you get some poor unsuspecting fool to swallow this farce or worse be impressed by it, it's their first act of blind obedience to the WT. The first time they will proclaim "yes yes this makes total sense, the emporah's clothes are beautiful."