Add to Cart Button and Show If Feature

I received a comment from a public user of our website, when registering for a workshop, stating that his shopping experience on our site was not user-friendly (see following page [hrworkshops.php]).

The user stated that he did not like how the webpage redirected him to the workshop registration page rather than to the cart page. He expressed interest in adding additional workshops to his shopping cart.

I understand how to modify the add to cart button to redirect a user to the cart.php page, but I will eventually need the user to register for the workshop using our registration form. The way it is currently setup, the user clicks the add to cart button and is redirected to the registration form where, when completed, the user is redirected to the cart page where he or she can complete the shopping process.

However, is it possible to keep the user from having to go back and repeat this process for each workshop? Ideally, I would like the user to add more than one workshop to the cart, and, when finished, be taken to the registration form and then redirected to the cart page to complete the shopping experience. Is this possible? Could this be accomplished by creating a Show If Region whereby the user would click the add to cart button and a Show If Regions would appear below the add to cart button revealing another button that coule redirect them to the registration page (when ready), while saving the workshops added to the cart within the session? That way, the user may be able to add more than one workshop to their cart while not leaving the page, and when finished, he or she could click the revealed button in the Show If Region to complete the shopping experience.

I have seem similar setups, such as Costco.com. Costco's website, when clicking on their add to cart button, reveals a view cart button on the same page, just below the add to cart button. This appears to allow the user to save their items in the shopping cart while not leaving the page.