I see the Sunday Market in Chiang Mai, Thailand as a well done attraction created for tourists. The stalls are selling mainly items of interest to tourists and food.
I really like that photo. Here is a similar photo my dad took of an artist drawing my brother (when he was a kid) and we were visiting Rome, Italy. There are a group of about 5 artists drawing portraits in the center of the street.
The street was quite packed. Starting just before sunset seems wise (based on my reading) and it worked for me. Others say it gets more crowded later – and it was plenty crowded while I was there. The Sunday market (also called the Walking Street Market) covers from Tha Pae gate to Wat Phra Singh on Ratchadamnoen Road.