If you want to extend your stay in the United States, you must file a request with U.S. Citizenship and Immigration Services (USCIS) on the Form I-539, Application to Extend/Change Nonimmigrant Status before your authorized stay expires.
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Typical reasons for extending B2 visa status includes continuation of tourism activities, social meetings with friends and relatives, and participating in social organizations and functions. In some cases it is prudent to change status from another nonimmigrant visa category to B1 or B2 status.
You can submit an application for an extension of stay by mail or you can file online using USCIS ELIS for an extension of stay before the expiration date on your Form I-94. (There are certain very limited circumstances under which USCIS will excuse a late submission.)
A visa is only an entry document and can expire while you are in the U.S. There is no issue if your visa expires while you are legally present in the U.S. As long as your status is still valid and you continue to follow all immigration regulations, you can continue to remain in the U.S. even if your visa has expired.