At SFO they meet up with their friends after school.
It is possible to sign up for full-time SFO, allowing children to come in in the morning before school and again after school. There’s also the option to just have an afternoon spot.
See the local fee rates for SFO in Kalundborg Municipality here:
SFO (Danish webpage).
The after-school programs are part of the primary school system and are attached to the individual primary schools. The school Head has overall educational and administrative responsibility. The school board supervises the after-school program, approves the budget of the institution, etc. You can read more about the national guidelines here:
Life In Denmark.