I'm really not a fan of this bill, but I don't see how a journalist merely covering an event could be sued for money under this.
(emphasis mine)
Journalistic activity certainly is a "lawful purpose".
The definition of an "unlawful assembly" is a bit vague in places, but nothing unusual as far as I see it:
Just on another thread on the front page a bunch of journalists were charged with felonies for covering riots
Based on the facts and circumstances, we determined that probable cause existed to support the filing of felony rioting charges, William Miller, a spokesman for the office, said in a statement. As in all of our cases, we are always willing to consider additional information that people bring forward.
Simple as that if you have the will and no shame.