One fundamental element to being a fruitful evangelist is consistency. This means evangelizing at the same location, like a local sports venue, or the same people, like fans at major sporting events.
Churches meets in the same location at the same time each week in part so people can find the church and attend. Imagine if the church met in different locations weekly and at different times that would make it more difficult for people to attend.
In others words people need to know they can depend on you. Once they learn they can trust you and that you will be at the same location and same time for events then you will be able to make deeper inroads into the lives of the people attending an event.