This screencast shows how to use fields when scheduling Rules components. In the example we are also using the Flag module, to allow people to sign up for reminder e-mails 24 hours before an event starts. The screencast covers:

• Using flags to load user lists in Rules
• Scheduling a rules component from a triggered rule
• Some words about rescheduling the evaluation if the event date should change
• Using conditions to make fields available in Rules configuration
• Using a date field to set evaluation time
• Adding an offset to the evaluation (-1 day)
• Verifying the configuration by executing the action set manually

Note: It would have been smarter to use the “Before saving content” event for this rule – to make it act on both new nodes and updates of existing ones. If combined with a check to see that the event is in the future, you would actually have pretty good notification system!