Annual meeting a couple of weeks into 1st term for each class, 1st thing in the morning. Spread across 2 weeks. Allows class teachers (for both classes) to outline this year's curriculum, specific concerns or things they want to remind parents of, elect class reps, and also allows parents to meet the teachers early on.
Weekly newsletters by email - they started emailing 2 years ago for a few things, but changed to all email (except hardcopy for those who have notified school that they are not using email) this year. These are whole school emails. There is a "return receipt" link to click to show you've got it too (Aladdin system) and I think that links to other systems in school admin too.
Roughly every month or 6 weeks, there is a hard copy News - either 4 or 6 A4 pages but folded from a large single sheet - which is printed professionally but put together by a couple of parents with news from each class, note from principal, note from PTA etc and a couple of highlights of achievements or "look how well school garden is doing". 1 per family (given to the youngest child in families where more than 1 child in school).
Principal is in yard every morning possible - mostly to supervise and chat to the kids, but always happy to talk to parents either just "Hello" or a "I have a problem" to mention it or arrange a meeting. In a month, she's probably there 18-19 days out of the 20.
Class reps generally send texts about things as needed and up to date contacts lists are done annually and checked at Christmas and Easter. Reps will send reminders of upcoming deadlines and events too (PTA and class reps groups both pretty good about coordinating).
Annual calendar is up on website, and some notices go up too, as do the "News" after being given out to school.
School secretary is great for any needs. To set up meetings with class teachers or principal, pass on messages, ringing without panicking you when DCs are sick, etc.
It is an "Educate Together" school, so the PTA has a very strong role, and there is a strong engagement with parents across the board, in terms of the teaching and class, and on fundraising, monthly coffee mornings, other volunteering roles etc. Which pays off, as for example, when local schools generally closed for a week or more in 2010 when there was bad snow, DD's school was only closed 1 day when the boiler failed - the "Snow Team" of the school caretaker and a voluntary group of parents went in every morning to clear paths around school and pupils arrived a half hour to an hour later than normal (Principal sent text each morning), stayed in hall at breaktimes, and only had to go home early 1 other day when snow was bad through the morning.