Nearly every field in the twenty-first century has room to develop, with new techniques, research, or resources becoming constantly available. Many professional organizations require continuing education because industries don't stay the same. Many of the best practitioners are the ones who learned in their initial training or degree, then kept building that knowledge, whether they were required to do formal education or not.
If you need to earn continuing education credits or want to stay at the front edge of your field and the modern aspects of the work, these continuing education opportunities are a great idea.