We understand that travel conditions may be uncertain for some participants and aim to communicate our policy clearly.

General policy
All registrations for UMAP 2026 are final and non-refundable. This policy is consistent with ACM conference guidelines and reflects financial commitments made to the venue and service providers.

Exceptional circumstances
Registered participants unable to attend due to visa issues or other valid, verifiable travel disruptions (such as canceled flights due to international conflicts or border closures) are eligible for a (partial) refund of their registration fee.
To request a refund, contact organizers at umap2026-chairs@um.org. Any requests will be considered on a case-by-case basis.
Please note that even where an exception is granted, certain costs (such as payment processing fees or non-recoverable supplier costs) may be deducted.
Note that requests must be sent no later than May 30, 2026.

Authors of accepted contributions (mandatory registration)
In accordance with ACM policy, at least one author of each accepted contribution must register for the conference.
This registration is mandatory and non-refundable, regardless of whether the author is ultimately able to attend the conference.

Failure to register may result in the contribution being removed from the conference proceedings.