"which are performed" is correct and usable in written English.
You can use it when referring to actions or tasks that have already happened. For example, "The orchestra performed several pieces, which are performed regularly at their concerts."
The final includes interval performances, which are performed while the juries deliberate and before the televote closes.
Kolo, communal dance of some Balkan areas, the many variations of which are performed at weddings and other festive occasions.
The dancers learn about 35 new routines each season, three of which are performed during each game.
Hence the songs which are performed to tinkly, beguiling arrangements of tunes from The Magic Flute.
Operations are partitioned into groups which are performed by spindle heads or by turrets.
This is, particularly, the case of non-linear analyses which are performed in designs and analyses.
The exercises, which are performed at the beginning of monastic training, involve asking yourself a question about each of a series of important topics before you meditate.
The proceeds are put toward commissioning new works, which are performed at an annual People's Commissioning Fund concert by the Bang on a Can All-Stars.
It also means a proliferation of ice-dance productions – versions of Swan Lake, Sleeping Beauty, even the Nutcracker itself – which are performed on skates rather than on pointe.
Four playwrights (Lisa D'Amour, Paul Zimet, Ellen Maddow and Lizzie Olesker) have written eight episodes, which are performed two at a time.
"First Name: Carmen," a modern story based loosely on the opera, replaces Bizet's music with the string quartets of Beethoven, which are performed onscreen by a quartet.
