I would like to say on behalf of everyone here

[lidboymk2]

I would like to say on behalf of everyone here
J'aimerais dire au nom de tous ceux qui sont venus

Merci

 

[sophie3210]

Maybe, according to text, you can replace place (here) by time (today), and you'll have something more natural in French :

J'aimerais dire, au nom de tous ceux présents aujourd'hui....