Hi Alexa
A seminar is an activity rather than a course . A course activities are reset when recertification is required and the recertification window opens.
Previous attendance data will be archived. Any event sessions that took place before the certification window opens will not count towards course completion. Seminar activities have a setting that allows learners to sign up for multiple sessions within the same activity, so learners can sign up for another session in the certification or recertification period if required.
There a variety of certification notifications that could be used with the following useful for reminding learbers
Certification due date
Recertification window open date
Certification expiry date
Regards