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Some parent-teacher meetings are specifically catered towards working parents, for example parent evenings (Elternabende). If you cannot make it to school very often, prioritize other lines of communication with teachers, like online portals, e-mails or phone conversations.
If you would like to get involved in school activities such as fundraisers or festivals, you might be able to participate through small volunteering opportunities that do not interfere with your working hours, such as baking cakes or the preparation for events.
