KapCon is a not-for-profit convention, but like most such conventions, still requires you to pay a fee and register your attendance. The fee is needed to pay for the venue, top up the prize pool, and pay for all the other incidental costs such as postage, copying, plastic cups etc.
While we would be glad to waive all fees if some kind soul would offer to cover our budget for us, registration would still be necessary, and pre-registration is preferable. Please take the time to pre-register, as the organizers need to make estimates on the number of people who will be attending to try to ensure there is enough space, enough games, enough coffee, etc., and the more people who register, the more accurate those estimates can be.