The key here is to select one or two that you can do something about. Once they see that you care about what they care about, maybe they will talk to and with you instead of at you. You can have all of the best of ideas that would make a world of difference for kids, but until the staff sees you as their leader, no one will follow. The same principles apply. I'd say to let me know how it goes, but it is a multi-year process.
Teachers also receive inservice credit for attending.
We do this during the winter months when teachers are hesitant to attend after school workshops. One of my classes this semester is in organizational theory. We have been working on a case study similar to your school, and have come to realize that a strong leadership skills are necessary. I think incentives would work very well in this case, but also try having your staff come together and verbalize their expectations of teaching performance. Maybe in that way you can create a new vision of what your school should be, and by creating that vison together, hopefully it will empower teachers.