The University of Texas International Office (International Student and Scholar Services) home page is here: https://world.utexas.edu/
Their main web page for international faculty and scholars is here: https://world.utexas.edu/isss/scholars
For information regarding Visa and eligibility concerns, Visa extensions, transitioning from J1 to H1B visa status and applying for a greencard, make an advising appointment at the International office:
http://world.utexas.edu/isss/advising#scholar
Monthly social hour, hosted by the International Office (ISSS): http://world.utexas.edu/isss/intercultural/scholarsocialhour
The International Office (ISSS) recently hosted an Immigration Updates Forum. Information about that forum can be found here: https://world.utexas.edu/about/features/international-immigration-forum
The National Postdoc Association has been posting information pertinent to international scholars in response to new executive orders and changes in immigration policies and procedures: http://www.nationalpostdoc.org/ These posts may be helpful for those who may be affected. Anyone employed at UT-Austin can become an affiliate member of the NPA for free, and sign up for email updates.
Paid internships are often not permitted for International Postdocs. Volunteering permits other networking opportunities: www.volunteermatch.org