Tosefta for Bava Batra 289:6

In a place where their custom is to return the betrothal money [if the betrothed man or woman died before the marriage was consummated], they return it. In a place where their custom is not to return the betrothal money, they do not return it. In a place where their custom is to stand up and sit down [for eulogies at a funeral], they stand up and sit down. In a place where their custom is to not do it, they do not do. [Even where the custom is to stand up and sit down for eulogies,] one does not stand up and sit down more than seven times. In a place where their custom is to greet mourners on the Sabbath, they greet them. In a place where their custom is not to greet, they do not greet. In a place where the custom is for the mourners to walk behind the dead [in a funeral procession], they walk [behind them]. In a place where the custom is to not walk, they do not walk. In a place where their custom is to light candles on Yom Kippur Eve, they light candles. In a place where their custom is not to light, they do not light. Rabbi Shimon ben Elazar says, we light [candles] in inns and in mikvehs [on Yom Kippur Eve]. Those of whom it was said "they light," and those of whom it was said, "they do not light," they only said it in order [that people not become] accustomed to sin.