Brazen have erected 11 pink plaques.
Those responsible said they deliberately did not ask permission, but said they can be easily removed.
One is outside The Golden Lion, where Bristol band IDLES held their first gig. Another is at Aardman’s Banana Warehouse to celebrate Creature Comforts, and another in Stoke Gifford highlights the creation of the online movie database IMDb.
Other venues marked by the plaques are no longer there, including the former Bristol Bierkeller where Nirvana opened their Nevermind Tour in 1991 and the legendary nightclub the Dug Out, which was important in the development of trip hop.
The Brazen team is also organising a new five-day festival of technology, creativity and culture in Bristol from 9 to 13 November; it will feature talks, debates, technology showcases and performances.