Today is "Good Friday" you know and in the Caribbean it is one of the days of the year you MUST go to church. For the past 6-7 years the church in Dorado, Puerto Rico has had a service on Good Friday, with lots of visitors. You see most of the 40 + that were present today--25 of them were non-Christian visitors. If you subtract the 7 of us who came from other churches you see that the members were way outnumbered by the members. The good thing about the non-Christians is that many of them are family of the local brethren, so there is a point of contact to study in the future.
I know some would pale at the idea of "celebrating" this Roman Catholic tradition, which cannot be found in the Bible. If they were celebrating it like others do I would agree, but they are not. People here are looking for a place to "go to church" today, so why not use it to teach them the truth? In 1 Cor. 9:22 Paul says, "I have become all things to all men, that I might by all means save some."
Think about what you can take advantage of to preach the Gospel.