Just to be clear I suggest two rules:
- A limit of 300 contestants with a deadline of March 1st to register.
- Each contestant has one page entered and must declare that page by March 1st.
My suggested deadline should be February 15th, not March 1st but I see you want everyone to be involved.
A declared page deadline keeps someone from switching a few days before the end. This contest is those SEO consultants who know what they want to achieve not or those who "fall into it"
My opinion only to keep it fun for everyone....