An example, now when you're nearby the Elfsong's entrance there is such a trigger with the following characteristics :
Text :
The name of this tavern derives from an unusual haunting: a ghostly female elven voice heard periodically throughout the establishment. TheElfsong serves virtually every kind of alcohol known. It is also known for its melted cheese sandwiches (spicing optional), pickles, and fist-sized twists of dried herring. A secret known to the locals is that all the food is heavily salted to make patrons drink more. The tavern is famed for a thick stew beloved by many sick or cold sailors as well as the citizenry of Baldur's Gate.
Skill : Lore, Local
DC : 10
Reward : 0 exp
Do you want to add more of those ? Suggest ! Ideally with a minimap screenshot, the text (mandatory obviously), the skill and the DC to pass. It'll be reviewed and eventually added if approved.