Harrah's properties are having a swipe contest running until sometime in
April. You can swipe each day. Most of the swipe prizes seem to be $5, but
someone will win $25,000 (maybe at each property -- check Harrahs.com for more
details). You also get an instant win card which may win for prizes such as
cash or buffet or shows.
At Harrah's Vegas the swipe area is to the left of the Diamond Total Rewards
desk.
You seem to be able to swipe at both the Rio and Harrah's in one day, but
you aren't supposed to swipe more than once a day.
After 8 swipes (for myself and husband) we had one win - $5.
[Non-text portions of this message have been removed]