Letters of Intent for Symposia in 2020 are due September 15. Further information may be found at https://www.iau.org/news/announcements/detail/ann17038be sure to follow the links on this page to obtain valuable information about the procedure.
IAU Ph.D Prize nominations are due December 15. These will recognize outstanding scientific achievement through a thesis defended between December 16 2017 and December 15 2018. See https://www.iau.org/science/grants_prizes/phd_prize/ for further information.