Yes. You can choose to make the PayPal payment optional in your customized Self-Book Templates. This means your Visitors will have a choice as to whether or not they'd like to pre-pay when they book an event. 

For instructions on how to set up Paypal payment for your Calendar sign-ups, visit our Paypal solutions article.

Note: We recommend creating a customized Self-Book Form for templates that include Paypal Payment so that you can write instructions & options for payment.

If you are having problems with your PayPal button not working, learn more about how to troubleshoot your PayPal button. Learn more about Self-Book in the Setting up Self-Book solutions folder.