You can register via the link above to get IHG One Rewards Platinum status for 120 days after registering. Just select any other hotel program that you belong to, you don’t need elite status in the other program.
Registration ends 7/31, so you can time this to coincide with when you’re ready to stay in an IHG hotel.
Platinum status includes 60% bonus points on stays, room upgrades, and a welcome amenity.
If you make 5 paid stays ($30+) within 120 days you’ll remain Platinum through the end of next year. If you make 15 paid stays within 120 days you’ll get Diamond status through the end of next year. That includes 100% bonus points on stays, breakfast, and a dedicated phone line.