Chains Unbroken

Exegol
Sith Citadel
864 ABY
The deserts of Exegol were dark as light could barely breach its thick covering of sand and clouds - but every few moments a massive strike of lightning would show the silouhettes of buildings and tombs spanning entire valleys. A planet yet lost to the Galactic Maps, it had changes places a thousand times over the years - and hadn't seen such a gathering since the Battle in which Sidious lost centuries before; now there lay ships of every color and creed as Sith found themselves upon it once more. Gathered in various clumps around the galaxy - there was only one rule they had been given before the gathering;
There would be no blood shed upon Exegol.
It was common knowledge that the Sith were at eachother's throat abroad - for personal reasons, for theological; but they fought for a thousand reasons. In those hyperlanes, in the orbits of planets stained by war - they would kill eachother at their own content, but a pact was formed for those of the Sith Faith that Exegol would be a zone of nuetrality. A compromise to the backstabbing and conflict they thrived on, with a need to consider the future of the Order as a whole; against the Jedi, the Imperials, and the fate of the Sith themselves.
For this reason, training exercises were set up in portions of the Sith Citadel, feasts were held for the percieved arrival of a golden age, and others slink away for politics and pleasure. Others still did not cease their work - as teams of Sith loyalists unloaded supplies and building matierals to bring the planet back up to the glory it once held under the Final Order. Yet more were given the task of clearing out structures infested with squatters - corrupted and inbred as they were after generations of living upon the planet in isolation.
Setting One: The Dark Lords (Open to Faction Leadership / Ask to Join)
In one of the highest towers within the Sith Citadel, a special meal was set out. Wine served in obsidian and golden chalices, imported delicacies lining a specially carved stone table - ur-Kittat lining its edge with words of power, the Sith Code, and some of the history of the Order. Around them were four windows in the cardinal directions - displaying a view just over the cloud coverage. Between the windows, Busts of some of the legendary Sith Lords from the greatest era's of Sith's history.
From Sidious and Valkorian, to Tulak Hord and Bane; they looked upon the table with a glower that spoke to their historic efforts and power. At the table was lined some of the greatest Sith of the current era; but the first to arrive was the multi masked figure of the Worm. Golden masks unmoving, with an empty plate before him - seated next to the Dark Council of the Sith Eternal. From the massive figure of Darth Apedemak, Fist of the Emperor, to the Chiss Darth Bourous - ignoring the others as he ate at the meat on his plate. Missing was the notorious Qual'Al-Selim, but there was also
Darth Vulcanus
; the special guest of the Worm.

Rather, he was brought before them to serve as an example. The first successful Canonization of the era, the Worm had brought him as a show of strength, and as a proposal to the others gathered.
Setting Two: Feast of the Horde
In the ground levels of the Sith Citadel, a gathering of the Sith of unknown precedent was taking place. Hundreds to thousands of Sith were eating, drinking, and throwing chalices about in the more unruly places, while the others instead sat gathered in the regality of their fanciful garment. Some had begun to get into fist fights - over words, over women and men, or over a slab of meat - but each was broken up quickly by the Sith Prefects and Sith Holy Guard. Violence was not permitted on the grounds, and those who broke the rule were brought outside to be exiled during the extent of the gathering - or summarily executed, if the grevious was large enough.
Every faction of Sith had moved to gather themselves for posturing and politicking - as information was traded, deals were made for corporations, or training documents were used to grease palms; there would be no shortage of social circles forming. Few times in history have Sith had a nuetral zone to meet one another - to appreciate eachother's collective skills, reputation, or accomplishments without seeing it solely as a thread. Unbound by the Faction limitations, each was open in such a way they would not normally be.
Setting Three: Infestation
Far from the Citadel, in tombs yet unclaimed, building yet to be rebuilt - there existed an infestation that had yet to be settled. After the fall of the Final Order, cultists had been abandoned upon the planet for centuries - leading to foremost a terrible case of inbreeding that made most abominations in genetics. The others, however, had been further corrupted by the Dark Side; leading to crippled crawling creatures at best, and massive Sithspawns with clubs for arms at worse - but they were dangerous, and needed to be removed if the planet was to be brought back to its old glory.
Teams gathered from multiple Sith Orders had been brought together to strike these buildings clean - but their reasons to do such were often their own. Some would be there only to get first claimant on lost knowledge, others were interested in studying the fighting style of other Sith Orders, and some just wanted to prove themselves before the entirety of the Sith Order at once. There would be no shortage of glory seekers, and with rumors abound about leviathans made of corpses in the depths of some of the buildings - they would have all the glory they could want.