Need to send out a mass enrolment window for everyone eligible for Benefit plan in program

Summary:

We have a requirement where in March, we will need to send out a mass enrolment window for everyone eligible for Benefit plan in program who might have missed the enrolment window for some reasons.

We need to achieve this by creating a life event attached to plan based on Grade element eligibility criteria.

Ideally, this would create a new restricted life event on 1st of March for 30 days for anyone that was in a eligible grade.

How this can be achieved please?

Thanks in advance.

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