The Imaam recites a wird immediately after the Fardh of Maghrib, and all the musallis are expected to participate.

Answer

The recitation of the wird after Maghrib is baseless. There is no need to participate in it. Rasulullah (sallallahu alayhi wasallam) severely reprimanded the Imaam who makes it difficult on the people with very lengthy Qiraa't. The two Sunnat raka'ts should be performed immediately after the Fardh. Besides the short dua after Fardh, there should be no other Thikr, Dua, etc. This wird is bid'ah.