The opening ceremony for the Paris Olympics is set for tonight. Instead of a traditional march into a stadium, about 10,500 athletes will parade on more than 90 boats on the Seine River for 3.7 miles. This will start the ceremony, not mark the end of it, another break from tradition. The ceremony starts at 1:30 p.m. EDT and is expected to last more than three hours. The ceremony will air on NBC and stream on Peacock and NBC Olympic platforms — NBCOlympics.com, NBC.com, NBC app, NBC Olympics app. A preview will air on NBC at noon EDT, with live coverage beginning at 1:30 p.m. and an enhanced prime-time encore at 7:30 p.m.