One resources had this to say :
July 25 is . . . . Threading The Needle Day. Sexual Innuendo for the win!
Wiki had this to say:
The Furrinalia (or Furinalia) were Roman festivals instituted in honour of Furrina, the goddess of robbers among the Romans; they took place on July 25. This goddess had a temple at Rome, and was served by a particular priest, who was one of the fifteen Flamens. Near the temple there was a sacred wood, in which Caius Gracchus was killed. Cicero takes her to be the same as one of the Furies.
Inca festival in honor of the thunder god Ilyap'a
and it's also Commonwealth Constitution Day, formerly Occupation Day. (Puerto Rico)
also: http://www.wisegeek.com/what-happened-on-july-25.htm
The first woman walked in space. (1984) Russian astronaut Svetlana Savitskaya performed a space walk while stationed on the Soviet space station Salyut 7. She also was the second woman in space ? the first was Russian astronaut Valentina Tereshkova, 17 years earlier.
The world's first in-vitro fertilization baby was born. (1978) Louise Brown was born in Oldham, England. Her parents, Lesley and Peter Brown, had tried for years to have a baby, but Lesley suffered from blocked fallopian tubes. The doctors, a British gynecologist named Patrick Steptoe and a scientist named Robert Edwards, successfully performed the first procedure. Though it was controversial at the time, the procedure now is considered mainstream ? hundreds of thousands of babies have been conceived via IVF.
Not really holidays, but it still clearly shows that July 25th kicks ass.