My immigrant visa (F1 "unmarried son or daughter") has been approved and issued. However, I plan to get married in Guam soon (my fiance is a non-US citizen). If I enter Houston and have my immigrant visa endorsed at the port of entry, then get married in Guam (say within one week), will my immigrant visa be revoked because of the change in marital status too soon? Will this be considered as "visa fraud"?
Do I need to stay in Houston for some time, after my immigrant visa is endorsed, before I can travel to Guam? If not, do I need to go back to Houston immediately after my wedding ceremony? Can I come to Hong Kong (my birth place) to finalise the matters (e.g. resign from employment etc.) before going back to the US? Thank you very much for your advice!

