For those who don't know, a Sukkah is a booth or hut constructed with at least two and a half walls (most have four) and a roof made of branches or other organic plant material which allows the sky to be seen through it. (Don't worry, nobody sits in it in the rain.) Jews construct it for living in during the holiday of Sukkot, which begins two weeks after Rosh Hashanah and lasts for seven days
If you don't know about Sukkot, there's a cute, short and fun, video called "Sukkot: a celebration for every nation": https://youtu.be/iZ8WLRNEDWg
showing Sukkot (and sukkahs) in Israel and people from around the world coming to celebrate in Israel. (Interestingly, there are non-Jews who also come, hence the title).