April 15, 2026 — Registration, abstract submission, and fee payment open
July 1, 2026 — Abstract submission deadline
August 15, 2026 — Notification of selected talks and posters
August 21, 2026 — Deadline for IAU travel grant requests (for students and early-career researchers)
August 31, 2026 — Payment deadline (after this date, the fee increases)
September 12, 2026 — Deadline for visa assistance requests
October 20, 2026 — Deadline for late fee payment
November 30, 2026 — Conference begins
December 4, 2026 — Conference ends