When the rains taper off and the northern Thai heat softens, Chiang Mai's high season kicks off with one of its most anticipated gatherings: the Citylife Garden Fair. Now in its 21st year, the event takes place on 21 November at the leafy Boonthanoo Gardens in Suthep district, just west of the city centre, and organisers expect more than 15,000 visitors.

What started as a modest fundraising garden fair after the 2005 Indian Ocean tsunami has grown into a sprawling shopping and entertainment day. This edition will feature over 400 stalls selling handmade goods, plants, homeware, crafts, fashion, art, gifts and local products. Come hungry too — there's a wide spread of food and nibbles to keep crowds going through the day.

The entertainment runs from morning to night. Local school bands play during the day, with raffle draws and a 4pm live auction sprinkled in, and popular Chiang Mai bands take the stage later in the evening. Prizes come from a host of supportive northern businesses.

There's a serious side to all this: over two decades the fair has raised millions of baht for charities and causes across northern Thailand and beyond, backed by a long list of organisations working on medical projects, disaster relief, environmental initiatives and support for vulnerable communities and children. This year's main beneficiary is the Philanthropy Connections Foundation's support of Ban Uark, a home and community project in Sangkhlaburi, Kanchanaburi province, which cares for 137 children and runs weekly outreach to elderly, disabled and disadvantaged people nearby. On top of that, 30% of funds raised will go toward Boonthanoo's Chiang Mai air-filtering lending library — a clever local response to the province's annual smoke season, making purifiers more affordable for residents.

Practicalities matter when 15,000 people show up. Parking will be tight, so there's a regular 50-baht shuttle service running all day from Chiang Mai Airport Plaza. Entry is a small charity donation rather than a fixed ticket price, and the whole thing fits comfortably into a day trip — arrive in the morning for the stalls, stay for the evening music.

For travellers, this is a rare chance to see Chiang Mai's social and charitable scene at full tilt, pick up genuinely local crafts rather than mass-market souvenirs, and know your entry donation is doing real work. If your trip falls in November, it slots neatly alongside the city's other high-season highlights like the Yi Peng lantern festival later in the month.