In the book written by See Cheng, there was a chapter on the Seven Sisters.
Poster at the Chinatown Heritage Museum
On the eve of the 7th of 7th Moon, as I was walking home along New Bridge Road, I chanced upon this offering being placed and prepared for prayers. In the Chinese concept of time, 11pm of the day is the beginning of the next day.
Some friends commented that they remembered that "Chart Jie" celebrations were commemorated on the actual day of the 7th. Interestingly too, in the old days, most temple events would start on the beginning of the actual day, meaning perhaps, dawn. These days, most would do it at 11pm on the night before. But we know that we welcome the Chinese New Year on the even at 11pm. A trend for other celebrations perhaps.
I am looking for more tales of the celebration of the 7 Sisters.