The phrase "are occasionally held" is correct and usable in written English.
It can be used to describe events or activities that take place from time to time, rather than regularly or constantly.
Example: "Meetings are occasionally held to discuss project updates and team progress."
Alternatives: "are sometimes conducted" or "are held from time to time."
Services are occasionally held in a communal meeting room.
Graphic-arts classes are occasionally held at Images and Atelier de Marc and La Plume de Ma Tante.
Noncanonical sources, especially the apocryphal gospels, contain many sayings attributed to Jesus, as well as stories about him that are occasionally held to be "authentic".
Israel's tiny counter-bid has been to suggest an increase in the CIA presence at the "security" talks that are occasionally held.
He went on, "We are occasionally held in uncomfortable positions because now we're allowing too much, maybe, free speech in countries that haven't experienced it before".
Academic workshops and archaeological surveys are occasionally held there, but the footpath to the site is not part of the museum tour.
Previously, those drills were occasionally held the next morning.
An adjacent barn once contained a cafeteria, science labs, music-rehearsal rooms and a half basketball court, where dances were occasionally held.
That art should be an outright duplication (incorrectly called "imitation") of reality is a view that was put forward by the French novelist Émile Zola (1840 1902) in his book Le Roman expérimental (The Experimental Novel) and has been occasionally held (though not practiced) by painters reacting against Romanticism, such as the 19th-century French artist Gustave Courbet.
Scotland had its own parliament from the 13th century, which was occasionally held in open air.
As part of the Pongal celebrations, Jallikattu, a bull-taming village sport played on the last day of the festival, is occasionally held on the outskirts of the city.
