A true turnkey opportunity provides everything that is needed to open or take over the business (except hiring staff in most cases). A partial turnkey program will provide some or most of what is needed but will rely on the business owner to take care of the rest. Be sure you have a good understanding (in writing) of what you are getting when you purchase a turnkey operation so you know what you will be responsible for in order to open the business.
Eventbrite is an efficient, easy-to-use tool tons of marketers rely on not only to manage the logistics (like ticketing) of events but also to promote their events. Eventbrite lets you create an event landing page and allows you to set up your ticketing and payment for the event all within the same platform. The best part? Eventbrite is always free if you're hosting a free event!
In the case of cost per mille/click, the publisher is not concerned about whether a visitor is a member of the audience that the advertiser tries to attract and is able to convert because at this point the publisher has already earned his commission. This leaves the greater, and, in case of cost per mille, the full risk and loss (if the visitor cannot be converted) to the advertiser.