The reverberations of the Field Day music festival were still being heard in Sydney's Downing Centre court as a magistrate handed almost a dozen attendees criminal records for drug possession.

Magistrate John Favretto took the harsh course of action against 11 of the 184 people who were arrested on drug offences at the Sydney festival, which was held at The Domain on New Year's Day.

The Field Day festival

Most of those before Magistrate Favretto were first-time offenders but he rejected their pleas for leniency.

"These offences are too serious as people keep dying. It's got to stop," he said, as he convicted Cameron Dwyer, 20, and fined him $660. Dwyer was found by police to have four pills inside a condom in his underpants.