This is a “usability” (ease of use) enhancement in v6.3 release.
Earlier, adding multiple events in bulk to a set of specimens was a tedious task. The user had to go back to the specimens lists, select the same set of specimens, and add the event one by one.
From v6.3, the new “Save and Add More” button would allow the user to add multiple events in one go. This would reduce the clicks and errors due to repeated steps.
For more details refer: https://openspecimen.atlassian.net/wiki/x/DADxB