Thank you for reaching out to us! That is a great question and I would be happy to explain how it will work in one event. So, this can definitely be done in one event and you can also apply a discount if your registrants choose to sign up for all four. What you want to do is when you're setting up your event, fill out the event basics and then jump over to the setting page, this is where you will add all 4 events. I created a mock-up of how you should create the option for your registrants to select and pay for the events they can go to, or choose all four at a discounted rate. You will create these options under "Are You Offering Additional Items" and put in the prices and dates.
Please feel free to respond if you have any more questions!
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