Read this beautiful, explanatory write up from Chabad.org
Here we are giving you the opportunity to share Shabbat with your community in a fun and creative way!
Let's Chalk Shabbat was founded by a teenage girl who started chalking in front of her home every Friday. She chalked 3, bright, traditional candlesticks: 2 big and 1 small, reminding women and young girls to light their own candles Friday night.
She realized this was an idea too good to keep to herself. She shared the idea with others. The response was a contagious excitement. It was like an exploding soda can that was rolling around for a while - woosh!
People loved it, and wanted in.
She included the candle lighting time for that week and provided candles to the passers by who needed. Her neighbors would start to look out for the art, and rely on it for the time to light.