CLEAN : Badminton: Malaysias Lee gets backdated doping ban

The video discusses the setup of a VM elbow, followed by details of a competition and an athlete's suspension. The suspension, which began after a urine sample was taken at the 2014 World Championship in Copenhagen, ends on April 30th, 2015. The athlete plans to resume competing at the highest level immediately after the suspension period.

What event took place at the 2014 World Championship in Copenhagen?

What is the significance of the date April 30th, 2015, in the context of the text?