Count Llaf visits Arthur Poe while in disguise to convince the baker to leave the Baudelaire orphans with him in episode 1x02 "The Bad Beginning: Part Two".
Count Olaf puts on a theater production to force Violet Baudelaire to marry him in episode 1x02 "The Bad Beginning: Part Two".
Source: Toffsky — Twitter
Dr. Montgomery brings the kids and his fake assistant Stephano to the theater in episode 1x03 "The Reptile Room: Part One".
Source: Pop Goes The World — Twitter
The Baudelaire children arrive at a strange mill and are forced to take up jobs in episode 1x07 "The Miserable Mill: Part One". Klaus begins to act strangely and cause problems at the mill in episode 1x08 "The Miserable Mill: Part Two".
Source: Lindsay B — Twitter, What's Filming — Twitter
Source: What's Filming — Twitter