This is all well and good.
I wish to state that those who are attending but are not registering can not put their names on the list of "those planning to attend".
You must register to put your name in the list of "those planning to attend".
Unless the site has been modified.
Personally, I have sent my check and plan to attend, but I really think anyone that wanted to tell the rest they are attending, should be able to just put their name in the list...without the hitch of registering.
Just my opinion, doesn't mean anything.