There are a number of diff

There are a number of different manufacturers who make adapters to go from line to mic. Check the Beachtek website. Search for similar adapters on the internet.

A shotgun would be better then the on board mic – but you’ll still get audience noise.

Think about borrowing or renting equipment:

• You can record audio separately, positioned closer to the speaker, and mix it in post.
• A lav will work best either wired to a recorder (audio or video)
• A wireless lav even better.