meeting, meet, party, association, interview, join
会 centers on people coming together: a meeting, a party, an association, or an interview. The idea of joining or gathering is the common thread.
meeting; assembly; party; gathering; conference; athletic meet
company; corporation; firm
society; public; community; the world
to meet; to encounter; to see
mass meeting; convention; rally; conference; assembly; gathering
meeting; rendezvous; encounter
meeting; conference; session; assembly; council; convention; congress
chance; opportunity; occasion
stock company; corporation; kabushiki kaisha; KK
assembly hall; meeting place; venue; site; grounds
conversation; talk; chat
member; the membership
church; congregation
association; society; organization; organisation
president (of a society); chairman
National Diet; legislative assembly of Japan (1947-)
interview; audience; meeting; (viewing) party
congress; parliament; diet; legislative assembly
learned society; scientific society; academy; academic meeting; academic conference
accounting; finance; account; reckoning
meeting; assembly; gathering; congregation; convention; rally
to meet (by chance); to come across; to run across; to encounter; to happen upon
meeting again; reunion
city
会 is the modern simplified form of 會. The older form combines 亼 (a lid or cover) with 曰 (to speak) and 丷, suggesting people gathering under one roof to talk. The modern form retains the general idea of coming together.
The top 人 looks like a roof, and the bottom 云 suggests words or clouds. Picture people gathering under one roof to talk, forming a meeting or party.
For カイ, imagine a lively meeting where everyone shouts 'Hi!' as they join: 'Hi' sounds like カイ, and the meeting brings people together.