Now we are not using PayPal I recommend using Events->Event Front End for all events. Any necessary information should be inserted. The contact email will default to the event author unless you enter an alternative email address.
When the event is shown now it has a “Click here” that will enable an email to be sent to the event organiser.
If you find that you want to use the inbuilt event system to register participants you can choose Events -> Manage Events -> Add/Manage Events, find the event you want to change then click the RSVP tab and check the box to allow registration. This will open up a whole bunch of other possibilities too but for the moment this is all you need to do.
The advice pdf I created to use the full event system is linked below for more detailed instructions (