What defined an intervention was a. its ability to maximize the potential of a city, b. its base upon dreams and needs, c. it is designed and lead by Cape Town citizens and d. it addresses societal challenges. Have a look at the other interventions or get more details on their website.
100 in 1 Day was not an one-time-only festival as it was part of a global movement of citizen empowerment. Its roots lie in Bogotá, Colombia where the idea was born in 2012 and more than 250 dreams were manifested through urban interventions. From there, the idea spread to Costa Rica, El Salvador, Denmark and other countries.