How to create an event registration page selecting all items at once before checkout.

[gordonsick]

I want to create an event registration where people can select the main event plus options like tours. Each of these would have its own cost. I don't want to force the user to go to the checkout page for each item and then come back to get the next item. I want them to select all parts of the event at once (check boxes for what they select) and then send them to the Checkout page just once.