Twelfth celebrations begin with the lighting of bonfires across Northern Ireland, marking the start of a day associated with Protestant unionist traditions. Multiple reports describe communities coming together to light bonfires and prepare for related events. The early part of the day focuses on the main bonfire gatherings, which are held in areas where local tradition expects them, and where people gather to mark the occasion. Coverage also notes the seasonal context in which these events take place and the importance of public order arrangements, with organizers and authorities typically coordinating to manage crowds around bonfire sites. While details of particular locations and timings can vary by outlet, the central point is consistent: bonfires are lit as the first major sign that Twelfth festivities are underway. The reports collectively indicate that the celebrations proceed from these openings into later ceremonies and activities expected throughout the day, with attention also given to managing safety and ensuring events run in an orderly way.