On July 21, 1969 at 02:56:15 UTC Neil Armstrong stepped onto the surface on the Moon, uttering his famous line, "one small step for [a] man, one giant leap for mankind."
Regrettably, since then progress in space exploration has slowed and as of 2017 humanity has not yet reached the logical next step in the exploration of the final frontier: Mars. Many manned mars missions were planned, the earliest suggested in 1952, with a planned launch year of 1965. Currently, the most interesting planned mission is probably the one from SpaceX (see this question), which has a highly ambitious 2024 launch year. Meanwhile, NASA is planning to reach Mars in 2033.
Will a human land on Mars by July 21, 2069?
This question will resolve positively if a living human sets foot on the surface of Mars prior to July 21, 2069 at 02:56:15 UTC (100 years after the feat was achieved on the moon on Apollo 11). For resolution, credible media reports will suffice. Note that the requirements for a positive resolution are less strict than those laid out by Kennedy for the race to the moon in 1961, as getting humans back to earth alive is not required for this question.
Closing time has been symbolically set to the 50th anniversary of the first Moon landing: July 21, 2019 at 02:56.