Conferences i/o includes an option that allows attendees to skip rating and multiple choice evaluation questions if they feel it does not apply to them.

This setting can be enabled on a question-by-question basis, and is not available to long answer and short answer forms of evaluation questions, as these question formats do not require attendees to submit any content.

When attendees are responding, they will see a checkbox beneath the list of choices.

Reporting spreadsheets will also show when attendees have marked a particular question as not applicable.