I'd agree with Lauren about putting 'the' before 10th. The difference between 'honor' and 'honour' is nothing to do with formality, however. The former is American spelling, the latter is British. You can use either spelling, but do try to be consistent. And on the subject of formality, I think 'thank you' would be more appropriate than 'thanks' in the last line - thanks is too informal for a speech like this. And maybe 'kind invitation' would be better than 'sincere'. Hope these tips are useful.

Perfect!! :D Apart from I would put 'the' before "10th International..." and change 'honor' to 'honour', (although either would be correct, 'honour' is considered more formal) ..So: "Good morning, everyone. I am Evert. It’s my honour to be invited to the opening ceremony of the 10th International Cultural and Creative Industry Expo. Thanks for the sincere invitation from Chairman Mr.Li and President Mr He of MKH.Group." I hope this helped^^