"Call to order" is a common phrase used in formal meetings or gatherings to indicate the start of the proceedings. However, there are several synonyms that can be used instead of "call to order" to add variety to your language. You could say "commence," "begin," "initiate," or "launch" to signal the start of the event. Other options include "kick off," "start off," or "get underway." These synonyms add a fresh angle to familiar phrases and enhance the language of formal events. By using synonyms like these, you can capture your listeners' attention and add an element of excitement and curiosity to your event.