11 possible reasons why concert goers gave Ne-Yo and R Kelly the red light.

Ne-Yo and R Kelly’s best before date may have passed especially the latter. (Nigel Telesford described him as aging)
Perception that R Kelly does not show up fueled by press articles.
Promoter mixed callalloo with steak. The musical genres just did not belong in the same plate.
Divali Holiday meant they may have lost at least 50% of the population.
Pricing seemed to lack local market knowledge and current trend towards boat rides, smaller “house” gatherings and pavement pubbing.
Promotional material lacked oomph; neither engaging nor plentiful. Moreover it was not blessed by any of the urban stations especially 96.1. (as far as I can tell)
The cost of production meant that it was always going to be an expensive outing (and a “Mount Everest Break-even”)
Recording acts do not necessarily make for performing acts.
The Stadium is a tough place to sell except for Machel Monday and Fantastic Friday. (= height of Carnival Season with local locals and foreign locals at their peak partying time)
Pre-Christmas and Pre-Carnival “budgeting priorities” may have relegated this product to: “I will have to read about this one on FB”.
People did not know the promoters. People like to know who they are buying from.