DrupalCon, Symfony Live and WebVisions will co-locate their May 2013 conference in Portland, Oregon

attendees can buy a pass to just one of three conferences or purchase a Combo Pass to get access to all three events, which will include admission to an exhibit hall and the attendee lunches. Tickets for Symfony Live and WebVisions will be available this month, and DrupalCon Portland will will go on sale January 2013.

We are still responsible for adding the additional products to the user's cart when selected. We do this by adding custom submit handlers to the form. In this case we add two custom submit handlers, one before the standard one to clear the cart in case there's anything else in there, and one after where we add the selected optional products.