There have been many workshops and tutorials given about napari. This page contains a list, to make them easier to find online.
You can find more videos of talks, tutorials and demos on the napari youtube channel.
Workshops are listed from newest to oldest.
June 2021, Bioimage analysis fundamentals in Python workshop at SciPy 2021
November 2020, scikit-image, napari, & friends workshop at the I2K conference
June 2020, NEUBIAS Academy@Home workshop