大会: convention / 大海: large sea, ocean / 退会: withdrawal, especially from a group of some kind

退会: withdraw

平ら: flatness

平ら: flat, even, level, smooth, having no variation in altitude

平: a male given name / 平: a surname

太平:

an axis (second cervical vertebra)

Literally means for a low-lying land or ground, consequently, a lower swampy field or backswamp suitable for a paddy field. But, at present, it can only be found that it is used as a place-name or its element for one with such a topographic feature, in addition, as a surname or its part named after such a place name, as a dialectal Chinese character used in Ibaraki and Fukushima Prefecture, Japan, while being one of 国字, Japanese-made Chinese characters.

a place name / a surname

shoemaker / shoe store / cobbler / a person who sells shoes