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when in Rome (do as the Romans do)
One should do what is customary or typical in a particular place or setting, especially when one is a tourist. I know you don't normally get relish on your hot dog, but that's the thing here. When in Rome, do as the Romans do. I don't love cotton candy, but we are at a carnival. When in Rome, right?
An entertaining event, affair, or activity that relies on the exploitation, suffering, or failure of others. A metaphor taken from Lord Byron's poem Childe Harold's Pilgrimage, which refers to the practice of having gladiators fight to the death for the amusement of spectators. I think tabloids exist and flourish as a means of providing people with miniature Roman holidays. Being able to see celebrities at their absolute worst gives us a perverse feeling of satisfaction. I'll never understand the allure of boxing, watching two people beat each other half to death like we're on some sort of Roman holiday.
when in Rome do as the Romans do
Follow local custom, as in Kate said they'd all be wearing shorts or blue jeans to the outdoor wedding, so when in Rome-we'll do the same . This advice allegedly was Saint Ambrose's answer to Saint Augustine when asked whether they should fast on Saturday as Romans did, or not, as in Milan. It appeared in English by about 1530 and remains so well known that it is often shortened, as in the example.
a Roman holidayan occasion on which enjoyment or profit is derived from the suffering or discomfort of others.
This expression comes from the poet Byron's description of the dying gladiator in Childe Harold's Pilgrimage as having been ‘butchered to make a Roman holiday’.