We'll be in Barcelona October 31-November 3 and would like to see the dancing of the Sardana. I've done quite a bit of research and I think it's done on Sunday at 11:15 in front of the Cathedral but have seen conflicting reports. I'm trying to plan our other sightseeing for Sunday so it would be helpful to know for sure when it will occur. If you have been in Barcelona recently and know when it is done, that information would be helpful. Thanks!

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Thanks for the information. We do hope to see this!

Yes, the start of the Sunday sardana dancing on Cathedral Square, officially, is at 11:15 am, but all participants, members of the sardana dance organization, the Agrupació Cultural Folklòrico, don't usually arrive at the same time, but instead little by little.
They actually have 2 performances listed on their web page for your dates:
Friday, Nov. 1 (All Saints Day) and Sunday, Nov. 3.
https://acfbarcelona.cat/ballades/

Maribel - Thanks so much for the information and link. I've added both to my sightseeing plan in hope of catching one of them!