Weeks later , Thompson and Acosta returned to Las Vegas to report for `` Rolling Stone '' on the National District Attorneys Association 's Conference on Narcotics and Dangerous Drugs being held from 25 -- 29 April 1971 , and to add material to the larger `` Fear and Loathing '' narrative .
Weeks later , Thompson and Acosta returned to Las Vegas to report for `` Rolling Stone '' on the National District Attorneys Association 's Conference on Narcotics and Dangerous Drugs being held from the 25 to 29 April 1971 , and to add material to the larger `` Fear and Loathing '' narrative .