Here are some mailing lists that you might be interested in joining.
Math DUS news: Click here [1] for more information, and sign up for the DUS mailing list [2]here
YUMS: Link to sign up for weekly newsletter: https://forms.gle/2G3TrtyNrjuQNxsj8 [3] . Contact (updated summer 2023): helen.lyons@yale.edu [4] and maxwell.zhou@yale.edu [5]
Dimensions: Please visit us at our website [6] or our Istagram page [7].
Yale Math Competition: coordinator@mmaths.org [8]
Putnam seminar: Contact (2023-24): andrew.yarmola@yale.edu [9]
Math counts outreach: mathcountsyale@gmail.com [10]
Links
[1] https://math.yale.edu/math-major-and-advanced-courses-faq-0#Question29c
[2] https://subscribe.yale.edu/browse?search=math+dus
[3] https://forms.gle/2G3TrtyNrjuQNxsj8
[4] mailto:helen.lyons@yale.edu
[5] mailto:maxwell.zhou@yale.edu
[6] https://www.yaledimensions.org
[7] https://www.instagram.com/yaledimensions/
[8] mailto:coordinator@mmaths.org
[9] mailto:andrew.yarmola@yale.edu
[10] mailto:mathcountsyale@gmail.com