I think that the general information that you are looking for, regarding events and local scene and, is very well covered in the main pages of this site - try the Events section, and searching the main site with keywords like "Sunday School" and you should find what you are after.
Regarding guest rooms at around 50TT per night - wow

that is very cheap, at about £4.50UK per night! 50US$ is more typical, though I guess that is not what you want. Are you expecting a roof?
I just tried Eat and Sleep->Accommodation and entered US30$ as maximum and mostly only properties for which no price was available came up, though there were a couple for 20US$, which is about 120TT I guess? I suggest that you run the search and see what comes up.
Steve F.