No one dances at the capital park mosque sxb they gather to do digri, I have attended that mosque and never saw what you saw.
Plus, Sufis worshipping grave is Salafi propaganda. They simply visit the graves of pious people because they are gardens of heaven and earth. I've never heard or some them do it, it's complete bullshit.
The ones in Asia are fake Sufis who completely hijacked the real Sufism.