... my heartfelt appreciation to the large number of participants in attendance.

[Tan Elaine]

I would like to express my heartfelt appreciation to the large number of participants in attendance.

Is the phrase in bold fine?

Thanks.

 

[EnglishLearner1990]

Would you like to explain why you want to add in attendance?
I'm not saying it's wrong, but I see no need for it (without further context).

(I an not a teacher.)

 

[MikeNewYork]

I would like to express my heartfelt appreciation to the large number of participants in attendance.

Is the phrase in bold fine?

Thanks.

I also want to know why the two words are used. It seems to me that the speaker cannot thank people who are not there. If the people in attendence are just a part of those who participated in something else, this might work.