Having gone to school in the 50s I can assure you primary schools are most definitely not stuck in the 50s.
In the 50s parents have very little input into what was happening in their child's school.
I remember having to take spellings and times tables home to learn but apart from that my parents weren't informed about anything that was happening in my school.
Primary schools now seem to be very child friendly. In the 50 children were still being slapped for the smallest misdemeanour.
I lived in fear of most of my teachers in primary school.
I remember one incident when I was in the infants. A child was slapped so hard across the back of legs by the teacher that when she went home at lunch time the mark was still there - most children went home for lunch.
The child's mother turned up at the school with the child after the lunch break and after the mother left the teacher gave us all a very stern lecture that under no circumstance do we tell our parents what happens in school - we were about 6 years old at the time.
You might be bombarded with emails. The school might give you projects to do with your children and so on and clearly you find all this an imposition but, going by my grandchildren's school, school nowadays are generally happy places, not the places of fear they were in the 50s.
It's good that schools include the parents, that children can feel that home and school are connected in a positive way.
Get involved as much as you can. You can only do what's possible, you can't be in two places at once. Lot of children grow up knowing their parents can be at sports days or performances, it won't do them any harm.