What limits exist for custom Salesforce fields on event pages?

With the Events app, you have the ability to create as many custom Salesforce fields you'd like for your attendees to fill-out during the event registration process.  Even better, you can include any type of writable Salesforce field.

If you choose to disable Salesforce integration for a certain event, custom fields will not be visible on the front-end. Custom fields in Events are only supported with CRM integration.