Translation guide
The legislative body of Tokyo Metropolis. In Japanese, it is most commonly referred to as 東京都議会, often shortened to 都議会 in context.
The Tokyo Metropolitan Assembly holds regular sessions four times a year.
Common abbreviation. Used when the context of Tokyo is already clear.
A new ordinance was passed at the Metropolitan Assembly.
Talking about the location or the entity in a general sense
Specifically the building where the assembly meets.
The Tokyo Metropolitan Assembly Building is in Shinjuku Ward.
When Tokyo is already the topic, 都議会 (Togikai) is sufficient. Adding 東京 again can sound redundant.