Sneaking in, disrupting a guest speaker and shouting a few sentences doesn't seem very productive to me.
After the screening there was time for discussion, so at least you/they should've stayed until after the screening where they could have explained about this cause.
This action didn't do anything for anyone, except showing disrespect to a UvA researcher and Kriterion personnel.
Discussion
Sneaking in, disrupting a guest speaker and shouting a few sentences doesn't seem very productive to me.
After the screening there was time for discussion, so at least you/they should've stayed until after the screening where they could have explained about this cause.
This action didn't do anything for anyone, except showing disrespect to a UvA researcher and Kriterion personnel.