Start a 'Drop in' for lonely people. What age group can you best reach - kids, teenagers, Mums and Toddlers, working adults, the elderly? What time of day would be best? What sort of facilities can you provide?
Organise a family fun day with all sorts of weird challenges, a treasure hunt and a meal. How will you include the Christian content? The answer to this question is dependent on who is coming - are they 'fringe people' (adherents) or total outsiders? Have they a rudimentary faith or no faith at all?
Have a stall at a 'Body, Mind and Spirit Fair'. Have a curtained 'quiet place' for prayer, including focused guidance from the Bible. Also offer prayer for healing. If you are thinking of doing this get expert advice! You need to know what you are doing!