Mausoleum of the First Qin Emperor: Xi'an wind and percussion ensemble
https://ich.unesco.org/en/RL/xian-wind-and-percussion-ensemble-00212?RL=00212

Palmeral of Elche: Mystery play of Elche
https://ich.unesco.org/en/RL/mystery-play-of-elche-00018?RL=00018

Dubrovnik: Festivity of Saint Tryphon and the Kolo (chain dance) of Saint Tryphon, traditions of Croats from Boka Kotorska (Bay of Kotor) who live in the Republic of Croatia
"World Heritage site potentially related"
https://ich.unesco.org/en/RL/festivity-of-saint-tryphon-and-the-kolo-chain-dance-of-saint-tryphon-traditions-of-croats-from-boka-kotorska-bay-of-kotor-who-live-in-the-republic-of-croatia-01891?RL=01891

San Pedro de la Roca Castle: Knowledge of the light rum masters

Connection: Famous Bells

Belfries - The St. Rumbold's Tower in Mechelen has several named bells, of which Salvator is the biggest. The bells used to be set in motion by foot by the tower keeper and his helpers to be rung for the celebrations in the cathedral and also in emergency situations such as fire or in time of war. (Dutch Wikipedia)

Connection: Leaning Tower

Belfries - The belfry of Bruges is 83 meters high and leans slightly (87 centimeters towards Wollestraat). In the 13th century, the tower started to lean in a south-easterly direction, perhaps as a result of a filled in watercourse. A westward correction was applied to the elevation of the tower. To prevent further sagging, the corners of the tower were reinforced in 1554 with heavy pillars. (Dutch Wikipedia)

Connection: More than 500 steps to climb

Belfries - There are 515 steps to climb in the northern tower of the Cathedral of Our Lady in Antwerp. There are more steps leading up, but those are only accessible to staff. (Dutch Wikipedia)

Connection: Napoleon was here

Belfries - Napoleon ascended the St. Rumbold's Tower in Mechelen in 1803. (Dutch Wikipedia)

Connection: Renaissance

Belfries - Antwerp City Hall is a "Renaissance building [that] incorporates both Flemish and Italian influences". (Wikipedia)

Connection: Rococo

Belfries - City Hall of Lier is in the Brabant rococo style. (Dutch Wikipedia)

Connection: Sieges and Battles

Belfries - "Completed in 1565, [Antwerp City Hall] lasted hardly a decade before being burnt to a shell in the Spanish Fury of 1576." (Wikipedia)

and another which from the official UNESCO point of view suggests a relationship.

For example for alpinism, 5 WHS are identified as having a potential relationship.

Have we dismissed the Sir David Attenborough connection before?