They have been taken to different police stations of the summer state capital, a police official said.
While some activists were detained last night, several others were taken into custody this morning from Abi Guzar here.
They were here to hoist the national flag at the Lal Chowk, the official said.
Sources said the activists will remain in detention till the official function at Bakshi Stadium here concludes.
Meanwhile, former chief minister Omar Abdullah termed the detention of the activists as a “fixed match” by the government in which the BJP is a coalition partner.
“True definition of a fixed match. BJP government in J&K detains BJP office-bearers going out to hoist the National Flag,” he said in a tweet.