If you live in the area.

Join the Maryland C++ User Group

From the article:

After looking for and failing to find a C++ user group in Maryland, I decided to start one. If you live in the Baltimore/DC/NoVA area, use C++ for work or pleasure, and are interested in attending monthly-ish meetings related to C++, please join the meetup group at https://meetup.com/CppMaryland/. Topics for discussion will include current (C++11/14/17) features, the upcoming C++20 standard, build tools, standard containers and algorithms, design patterns, and pretty much anything else that might benefit a C++ developer...