DS's school don't do parent's evenings.
Instead parents can make an appointment to see the teacher anytime when the teacher is free, with a form going up in the last term with all her available slots that parents can put their name down for a time and talk to her then.
I think with this system parents talk to her a lot, so we get more feedback than if we just had one evening a year or term to discuss things.
I'm probably cornering her once a month at least for little chats about DS's progress