OpsMeetup Tokyo 2018
Date: March 7-8 2018
Venue: "Granpark Conference" 
- 5min walk from Tamachi Station, Tokyo, Japan
Any recommended hotels nearby?
There are plenty of nice hotels in Shinagawa area or Shimbashi/Shiodome area.
Several reasonable hotels in Tamachi area as well if you do not want to experience the morning rush-hour in Tokyo.