The AAVSO maintains a list of observing campaigns at https://www.aavso.org/aavso-alert-notices-for-observing-campaigns-and-discoveries
A recent example was the request from Dr Moritz Guenther at MIT for observations of Herbig Ae/Be stars which he and colleagues were planning to observer with the X-ray satellite Chandra. https://www.aavso.org/aavso-alert-notice-658
These are practical opportunities for amateurs to make a useful contribution to the progress of science. Those of us who participated have received encouraging positive feedback from him.