There are several synonyms for the phrase "question and answer sessions." One option is "Q&A sessions," which is a widely recognized abbreviation. Another alternative is "interactive dialogue," which emphasizes the back-and-forth exchange between the presenter and the audience. Additionally, "panel discussion" or "expert forum" could be used to describe a more formal or structured event, where a group of experts share their insights and opinions. Other phrases that could be used to describe a question and answer session might include "audience participation," "informal debate," or simply "open mic." Ultimately, the choice of language depends on the tone and context of the event, as well as the preferences of the speaker and host.