Provide simple focal points for ‘paying attention’ – possibly:

Earth, symbol of embodiment and care for the planet, e.g. a bowl of sand or soil in which to place lighted candles;
Water, symbol of beginnings, e.g. a filled font, fountain or bowl;
Fire, symbol of transfiguration, a place of sacrifice and meal, the fire that consumes and transforms e.g. a lighted candle;
Air, symbol of breath and language, make a place to listen thoughtfully to one another, to our ancestors, to the divine whisper.