Post-event surveys are a great way to better understand your target audience. These surveys can reveal a lot of insights as to what your attendees liked and disliked about your event.
However, like every other form of feedback, post-event surveys may not be adequately designed all the time. The questions asked on the surveys may not be relevant enough to produce useful answers that you can use for the future.
Find some great tips here on how you can design post-event surveys along with other related factors.