Between August 17 and 20, the World Dyslexia Forum took place in Belo Horizonte, Brazil. While searching for a possible attendance by Princess Margaretha, who is the patron of UNESCO's Dyslexia International, I actually discovered that Grand Duchess Maria-Teresa gave the welcome and opening remarks. However, she did not do so in person but by video instead. The Grand Duchess has been a UNESCO Goodwill Ambassador since 1997.
Source: World Dyslexia Forum