My childrens school sends out a calendar at the beginning of each term with important dates, match schedule, trips, etc etc.
Each week there is an e newsletter with news, and ANYTHING important is in this.
I have an e mail address for each class teacher and can e mail them on anything I need to. If I need to meet, I e mail and we set a time which works. If they have an issue they call me. Communication with the school is pretty good. Each child has a prep diary which homework set is recorded in and I sign every day. Teachers also write down a comment each week and I sign.
The website is updated with dates, dinner menus, match fixtures. School policies are clearly laid out. Bad weather closing was always posted on the website first thing in the morning.
You could also if you wanted do a txt messaging service set up centrally so parents could register a mobile number and get txts in bad weather, emergencies etc
I get lots of notice for costumes etc and dont get too many requests for stuff.
The school has very high standatrds on behaviour / uniform / bullying and these are enforced. It is very inclusive, with lots of activities for non team players or less academic children. Therre is a school council for the children and a very active PTA. As a result the school is a good environment and my boys are both looking forward to the start of term next sept