Attendance at some scientific conferences in the US is declining, while at others it remains stable. Science surveyed two dozen American scientific societies, and of the 16 respondents, only five reported a drop in participation of more than a few percentage points[2]. For example, the American Geophysical Union (AGU) meeting had over 21,000 attendees, down from 31,000 in 2024 but similar to 2017[2]. The American Statistical Association (ASA) reported a 14% decline at the Nashville meeting[2]. Reasons include visa issues, concerns about border hassles, cancellations from federal employees, and fewer international participants[1][2][3]. Some companies have canceled conferences or moved them online or outside the US[1]. Declining participation affects revenue, membership, and the future of scientific associations[1][2]. Conferences are crucial for training new scientists, feedback and collaboration[1].