Clicking on the Events button activates the Events window. You can select specific categories, to transfer all of the events contained within those categories, or transfer all events to your iPod.
The Set Default buttons allow you to define a preset date range that is automatically loaded into the Events window dates every time the window is activated or a sync is initiated. The date range is always based on an offset from today so it will automatically move to the correct range every time you transfer. The date range is put into effect by selecting Specify Date Range.
You can also choose to have alarms generated for every event transferred to your iPod. Events without a reminder will have an alarm set for the start of the event (note that this is the only way to get such an alarm from Entourage).