Ivan has decided to refer to the occasion as his attention getter.
Step-by-step explanation:
The speech that Ivan is supposed to convey here is the best man's as he is chosen by his friend to be the best man.
There are a couple of ways people would usually prepare for something like this and it usually is prepared beforehand as it is a big deal to be someone's best man in their wedding.
The choice he takes is a traditional one, in that he refers to the event as a beautiful ceremony and acknowledges the people who have gathered to witness it before he starts.