This problem of late announcements also applies to travelers that don't need visa. Recently, a major CS conference announced accepted papers two months before t

This problem of late announcements also applies to travelers that don't need visa. Recently, a major CS conference announced accepted papers two months before the conference date. Since it was a large federated conference located in a tourist destination in Florida, in the middle of the season, traveling from Europe was particularly expensive when buying tickets on a short notice. And there's the additional downside that it was too late to apply to workshops and posters at co-located conferences. Many major conferences take place in the US, which means that traveling just for a workshop paper might not be feasible for researchers based outside of the US due to university policies and budget constraints. Thus, it's a good opportunity to participate and publish additional results while you are already there.