Don't do this. Most/ often enough the main difference between people is small. In this case 'someone who is going to the 34c3' vs. 'someone who is not'. Quite

Don't do this. Most/ often enough the main difference between people is small. In this case 'someone who is going to the 34c3' vs. 'someone who is not'. Quite similiar 'someone who is doing a talk' vs. 'someone is not doing one'