Tokutenkai - Fan Rewards Sessions
All idol groups vie for the support of their fans. In return, fans try to support their favourite idols and favourite members. How do you support your favourites? You buy their goods and merchandise. In the underground idol world, the "Goods/Merchandise Sales" (物販 Buppan) is not always about buying actual goods (e.g. penlights, t-shirts, etc.) but can be about buying 'time' in way. AKB48 created what is called the trend of "idols you can meet" and the Underground idol industry is very much about that. It all happens in "reward sessions" for fans called "tokutenkai" (特典会), which are similar to what is called a "Meet & Greet" in the West.