Multiple levels of payment

I'd like to create an event and allow a registrant to chose whether to have a hotel room for the night. If they do, then the price (predefined) should be included accordingly.

At the moment, I believe I'd need to create two events and have the registrant chose the correct event.

Thanks

You could set up a yes/no radio button fee field for the hotel room. If the registrant selected, "yes", the fee would be added to the registration cost.