"according to a new report by the Government Accountability Institute, the President has attended 42.1% of them since he was sworn in"
The Government Accountability Institute (GAI) is a conservative nonprofit investigative research organization located in Tallahassee, Florida.[3][4] GAI was founded in 2012.
https://en.wikipedia.org/wiki/Government_Accountability_Institute
I'd have to question their conclusion of "since he was sworn in" since they only came into existence in the second half of his administration.  Then there's also a question of reliability being a conservative organization reporting about a Democrat.