The Grand Refectory existed as a chamber within the Jedi Temple, which was located on the planet of Coruscant. Approximately in 232 BBY, the Jedi High Council made preparations for the yearly Solstice Tide celebration inside the Grand Refectory, but Jedi Master Stellan Gios chose to depart from the temple and explore Coruscant's streets during the holiday.
The initial reference to the Grand Refectory occurred in "A Coruscant Solstice," a concise narrative penned by Cavan Scott and featured in the Life Day Treasury compilation from 2021.