There are many societies dedicated to neurology. Here are some that you might find useful.
National Institute of Neurological Disorders and Stroke (NINDS)
American Academy of Neurology (AAN)
American Neurological Association (ANA)
Society of Vascular and Interventional Neurology (SVIN)
American Stroke Association (ASA)
American Epilepsy Society (AES)
Neurocritical care society (NCS)
American Society of Neuroimaging (ASN)
American Association of Neuromuscular & Electrodiagnostic Medicine (AANEM)
American Clinical Neurophysiology Society (ACNS)
International Parkinson and Movement Disorder Society (MDS)
Americas Committee for Treatment and Research In Multiple Sclerosis (ACTRIMS)
European Committee for Treatment and Research In Multiple Sclerosis (ECTRIMS)
Society for NeuroOncology (SNO)
Society for Bahavioural and Cognitive Neurology (SBCN)
Child Neurology Society