Jackie Joyner set a world heptathlon record on this date in 1986

U.S. Olympic Festival
Houston, Texas
August 1-2, 1986

I attended this meet.

Heptathlon
1. Jackie Joyner 7158, 2. Cindy Greiner 6137, 3. Jolanda Jones 5747, 4. Lana Zimmerman 5571, 5. Cathee Tyree 5383, 6. Beth Sheehan 5022, 7. Peggy Odita 4937, 8. Criste 4911.
Joyner: 100mH: 13.18 (-0.5w), 200m: 22.85 (+1.2w), LJ: 7.03 (+2.9w)

7158* Jackie Joyner (USA)
Day 1
100m Hurdles 13.18
High Jump 1.88 6-2
Shot 15.20 49-10 1/2
200m 22.85
Day 2
Long Jump 7.03 23-0 3/4
Javelin 50.12 164-5
800m 2:09.69

*Intially recorded as 7161 points, with 13.16 in the 100m Hurdles, but a review by TAC Records Chairman, Bob Hersh, revealed the correct time to be 13.18, and the score was amended accordingly.

Source: IAAF World Records