No, it is NOT a requirement to be an EAA member to buy an admission
ticket -- unless they changed the rule from last year. You do have
the option at the gate to join and get the discounted admission
price.

And, if I remember correctly, you do not need to be a member to
park the aircraft, but if you want to camp with the aircraft, you
must be an EAA member.

On the other hand, in my case, senility set in with puberty and I
could be wrong.