Wiktionary
call to order
alt. (context transitive English) To formally signal the start of (a meeting or function or assembly or court). vb. (context transitive English) To formally signal the start of (a meeting or function or assembly or court).
WordNet
call to order
v. open formally; "the chairman called the meeting to order by pounding his gavel"
Usage examples of "call to order".
There's no agenda at a 2600 meeting, no call to order, no parliamentary procedure.
Handel was pounding his fists on the Bench top, pounding and pounding until they must have been bruised, pounding in joy, not in a call to order.