Several mini 'command centres' here.
Front door:Hooks by front door one for each person. Coats, bags etc on here. Basket for shoes. Come in door...immediately put all school bags etc on hook. Sort one by one after tea and repack, straight back on hook. Bowl for keys.
Kitchen:Letters from school x a million: a magazine file for each child on shelf in kitchen. All letters in here. Basket alongside for vouchers, tokens and other stuff that might need to go out to shops/school. Basket next to plug for all chargers. Phones live here.
Kitchen wall: family calendar with a week to view and columns for each person plus a spare one where I meal plan. Mainly filled in by me and DH but teens write their stuff on. If it ain't on the calendar with an appropriate amount of notice, it ain't happening. (DS1...10pm the night before is not appropriate amount of notice!)
Transfer calendar info to diary each week and vice verse. Diary kept in my bag and updated all day every day with things to do etc.
Car: swimming kit/sports kits live in the boot of my car, used, washed and re packed into bag and put back in the car as soon as used. I buy At least two sets of everything so there's always stuff clean and ready to use (charity shop/hand me downs,nothing expensive). Money for parking, spare sunglasses, baby wipes, carrier bags and old flip flops, an old raincoat, pen and notebook- has covered most emergencies when out and about. (Total set of Spare clothes for small children, obv!)
General: in airing cupboard I store old wellies, goggles, beach towels, snow boots etc never throw away so always have a hand me down pair for younger children. Keep old sheets for dressing up, making dens etc.
Cupboard under stairs: old day sack with plastic cups, blanket, baby wipes for making quick picnic for walks, park etc.