MardiGrass Organising Committee. For 33 years, MardiGrass has given voice to the Oz weed resistance, tirelessly educating and agitating for an end to the war on weed. As usual, MardiGrass offers mind-blowing ideas and education all weekend at the 2025 Hemposium, and is an extraordinary chance to share and learn about our favourite plant ally and healing herb. The Hemposium will showcase an impressive line-up of speakers …