* Formal: "The university hosted a symposium on the future of artificial intelligence, bringing together leading experts from academia and industry."
* Informal: "We had a lively symposium at the conference, discussing the latest trends in sustainable agriculture."
* Specific: "The symposium on ancient Greek philosophy was a huge success, with attendees captivated by the insightful presentations."
* Figurative: "The dinner table became a symposium of opinions as we debated the merits of different vacation destinations."
The best way to use "symposium" will depend on the specific context of your writing.