English: Cobs of corn (Photo credit: Wikipedia)
Desde 2009 se celebra en México el Día Nacional del Maíz, el cultivo nacional por excelencia dada la historia de este producto que ha acompañado a la sociedad desde la época precolombina. (source)The Jardín Etnobotánico de Oaxaca held a symposium, and I'm sure there were other activities.
I wish I'd known about it before it occurred so that I could have helped to highlight the activities.1
1Not that plugging it on this blog would help much, but it couldn't hurt.