Peter Bergethon, the head of digital and quantitative medicine at Biogen, went home to his wife, an infectious-disease doctor.

A Biogen vice president in the Alzheimer’s franchise and her husband attended

Candace Berry-Vaughn of Orangeburg, S.C., rotates each year between her husband’s family and hers. This year, about 80 people from her husband’s family were planning to gather in West Palm Beach,