To celebrate 100 years of the International Amateur Radio Union (IARU), the Spanish Unión de Radioaficionados Españoles (URE) has made available a diploma for successfully contacting special event stations during the 100 year celebration throughout April.
Over Easter I was lucky enough to contact the requisite number of stations during some exceptional propagation conditions, with the provisional diploma available shortly after.
The event concludes on 30th April, so you still have time to earn this award.