This is from their Facebook page after you like them:
The Great Getaway is on. If you hear travel calling you, don’t wait to answer – book now with our 24-Hour Bonus Offer. Plan your next Great Getaway today and earn 2,500 Bonus Points.
- Starting at 11:00 a.m. ET May 23 and ending on 10:59 a.m. ET May 24, book a stay between May 23 and September 30, 2013 at any hotel within the Hilton HHonors™ portfolio.
- Return here to enter your reservation confirmation number, HHonors number, and required information. Act fast – to earn Bonus Points you have to be one of the first 4,000 Hilton HHonors™ members to book and register.
- Complete your stay by September 30, 2013 and earn 2,500 Bonus Points.