In the Eruv Tavshilin we say when there's holiday followed by Sabbath, the proclamation is:
This eruv ("merging") shall allow us to cook, bake, insulate, and kindle on the holiday in preparation for the Sabbath.
In many texts, there's then the phrase in parentheses:
For us, and all the Jews in this town.
So who's supposed to say that phrase? Just the rabbi? (Which rabbi, if there's more than one in town?) You, if you think everyone else in town will forget to make an eruv?