No IP attorney. It's money wasted. If you're really doing something protectable, you can file a provisional patent up to a year after first public demo, and that gives you another year to file a real patent. You'll lose some international protection, but it's quite hard to stay internationally protected anyway. I am not a lawyer, please don't trust me. If neither you nor the person who wants to join the company are d…
Heed the caveat though - demonstration or use in public will be citable against an application elsewhere in the world. This is a good review of grace periods (from a European perspective but covering worldwide issues) -
http://www.ipr-helpdesk.org/documents/GracePeriodinventionLa...