A special ceremony to commemorate the life of Civil Rights Activist Vernon Dahmer Sr. will be held Sunday. The program will be held at Shady Grover Baptist Church in Hattiesburg at 3 p.m. Dahmer was a leader of the Forrest County NAACP. He was killed at his home 50 years ago. Governor Phil Bryant declared January 10 as Vernon Dahmer Day Friday. Copyright 2016 WDAM. All rights reserved
Vernon Dahmer was celebrated for his actions many years after his passing. 
It is correct and it was 50 years after he was killed that he was commemorated.  I think it was difficult for the system to determine because of the lack of specific information. 
( z1 celebrate :ARG1 ( z2 person :name ( z3 name :op "Vernon" :op "Dahmer" ) ) :ARG2 ( z4 act :ARG0 z2 ) :time ( z5 after :op ( z6 pass :ARG1 z2 ) :quant ( z7 many :op ( z8 temporal-quantity :quant 1 :unit ( z9 year ) ) ) ) )