Sometimes Datebook alarms go off days, weeks, or months early. But, if events are created in a specific order, then the alarm for these events is not activated prematurely.
When creating the repeating event, create the item in the following order:
1) Create the meeting or day note
2) In the event slip, set the Alarm
3) Set the Frequency
Make sure you set the Alarm before you set the Frequency. If you set the frequency first, the alarm for the event may go off early.