Knowing how to wear a tuxedo is important, just as knowing where to wear one is essential. Tuxedos are typically reserved for formal events that take place in the evening. These could include black-tie events, weddings, charity galas, opera or symphony performances, and formal dinners. However, the "rules" around when to wear a tuxedo have become less rigid over time, and it's ultimately up to the wearer's discretion.