So far I've identified two chess960 events for the [Carlsen] TMER. Were there others? Short answer: Yes.
The TMER is Magnus Carlsen's Tournament, Match, and Exhibition Record (2000-), currently up-to-date only through summer 2018. The two chess960 events were tournaments played on Lichess:-
GM Carlsen played using the handle DrNykterstein (lichess.org). From there we find three more events. The first was another 'Titled Arena' tournament, although he played only five games:-
- Chess960 Titled Arena Sep '19 (lichess.org)
The others ('Fischersjakk'!) were restricted events: 'Must be in team Offerspill Sjakklubb':-
Although the Lichess events are missing, the TMER records three other chess960 events, the last two currently marked 'In preparation':-
2018-02 Fischer Random Rapid/Blitz 2018; Baerum NOR
2019-10 World Fischer Random 2019; Hovikodden NOR
2020-09 Champ Showdown 9LX 2020; Lichess.org INT
All three have been covered on this blog. The last two 'In prep' events were:-
- So Beats Carlsen in FWFRCC Final (November 2019; NB: 'Hovikodden' not mentioned)
- 2020 Champions Showdown, Lichess (September 2020)
The 'Champions Showdown' is worth special mention because it was played on Lichess, but doesn't show up on the DrNykterstein account. If we follow a page for the three day event...
- 2020 Champions Showdown: Chess 9LX, Final Day (lichess.org)
...we see that Carlsen played on the account of STL_Carlsen (lichess.org). The other players in the elite event also played under 'STL' (St.Louis) names. Before playing on Lichess as DrNykterstein, GM Carlsen had another account, DrDrunkenstein (lichess.org). There are no chess960 games recorded on that account.