Can I re enter USA with automatic visa re-validation with expired Visa and 1.5 month of valid OPT and I-20?

Although your plan sounds feasible, there are dangers as an immigration inspector may question the appropriateness of re-admitting a person with limited time on OPT whose employment has just ended. That being said, even immigration officials are known to be more generous to persons coming to the US on Christmas. Due to the limitations of the Lawyers.com Forums, Alan Lee, Esq.'s (the "Firm") participation in responding to questions posted herein does not constitute legal advice, nor legal representation of the person or entity posting a question. No Attorney/Client relationship is or shall be construed to be created hereby. The information provided herein by the Firm is general, and requires that the poster obtain specific legal advice from an attorney. The poster shall not rely upon the information provided herein as legal advice nor as the basis for making any decisions of legal consequence.