Mid-Autumn Festival falls on Friday, September 25 this year, with a four-day stretch through Teacher’s Day on the 28th. If you arrived in the last six months, this is likely the first Taiwanese holiday that will reach into your actual week rather than sit on a calendar you meant to learn.

The public version is simple. Offices close. Families gather in the evening. People eat mooncakes they do not particularly like, and pomelos they do. The private version, the one that matters if you live here, is the balcony. Someone you work with, or the parents of a classmate, or the couple two floors up, will mention that they are grilling. You will be asked if you are free. You should say yes.

Bring fruit. Bring drinks that can sit on a tiled floor. Do not bring a speech about lanterns — Taiwan does not really do the Hong Kong harbour thing, and you will sound like you prepared for the wrong island. If there is a barbecue, stand near it and pass plates. If there is a moon, look at it when they look at it. That is the entire ritual.

The useful logistics: trains and HSR will fill on the Thursday night. Night markets will be louder than usual on the Friday. If you need a clinic, go before the 25th. If you have been meaning to go to the east coast, this is a crowded weekend to try it; the following one is kinder.

We will send a shorter note the week of the holiday with the weather and the last-minute supermarket picture. For now, the only thing to do is accept the invitation.