Hilton Hotels has a promotion which matches the elite status of any other hotel loyalty program free for 90 days. You can register online at this Hilton Honors Status match link. If you complete four stays in those 90 days, you can keep your Gold status extended through March 31, 2018. If you complete eight stays in those 90 days, you can keep your Diamond status extended through March 31, 2018.
Eligible hotel chains include but are not limited to Choice Hotels, Hyatt, IHG, Marriott, and Starwood Preferred Guest. As long as you might have even a single Hilton stay in the next 90 days, it may be worth registering in order to get the perks.