Why Norris and Leclerc have been summoned to the FIA stewards before hitting the track in Monaco

It's unusual for Formula 1 drivers to be summoned by the FIA stewards to explain themselves before even turning a wheel on track, but this is the fate which has befallen Lando Norris and Charles Leclerc in Monaco. Both drivers must report to the stewards on Friday after arriving late for the official FIA press conference on Thursday. This may seem trivial but it still constitutes a breach of.