Question: When did the accident occur that the 2017 Joan Gamper Trophy held a tribute for?
Sentence (from "LaMia Flight 2933"): LaMia Flight 2933 (LMI2933) was a charter flight of an Avro RJ85, operated by LaMia, which crashed in Colombia at 21:58 on 28 November 2016 killing 71 of 77 people on board.
Relevant evidence: Yes