Sukkot begins on the 15th of Tishrei and lasts for 7 days, plus an additional day (two outside of Israel) of Shmini Atzeret/Simchat Torah. It is the festival of booths ("tabernacles"), one of the three main chagim.
Specifically relevant tags: sukkah, schach, dofen-akuma, lulav-etrog-arba-minim, kohelet, hoshanos, hoshana-rabba, shmini-atzeres and simchat-torah
More general related tags are shabbos, geshem-tal-ruach shalosh-regalim, eruv-tavshilin, hallel, shehecheyanu, ochel-nefesh, hachana-prep-for-weekday, birchas-kohanim and yizkor, chol-hamoed, chagim-festivals.
Also see: masechet-sukkah