Answer the question at the end by quoting:

The Nitty Gritty Dirt Band, an American country rock band, has existed in various forms since its founding in Long Beach, California in 1966. The group's membership has had at least a dozen changes over the years, including a period from 1976 to 1981 when the band performed and recorded as the Dirt Band. Constant members since the early times are singer-guitarist Jeff Hanna and drummer Jimmie Fadden. Multi-instrumentalist John McEuen was with the band from 1966 to 1986 and returned during 2001 departing once again in November 2017.
The Nitty Gritty Dirt Band was founded around 1966 in Long Beach, California by singer-guitarist Jeff Hanna and singer-songwriter guitarist Bruce Kunkel who had performed as the New Coast Two and later the Illegitimate Jug Band. Trying, in the words of the band's website, to "figure out how not to have to work for a living," Hanna and Kunkel joined informal jam sessions at McCabe's Guitar Shop in Long Beach. There they met a few other musicians: guitarist/washtub bassist Ralph Barr, guitarist-clarinetist Les Thompson, harmonicist and jug player Jimmie Fadden, and guitarist-vocalist Jackson Browne. As Nitty Gritty Dirt Band, the six men started as a jug band and adopted the burgeoning southern California folk rock musical style, playing in local clubs while wearing pinstripe suits and cowboy boots. Their first paying performance was at the Golden Bear in Huntington Beach, California. Browne was in the band for only a few months before he left to concentrate on a solo career as a singer-songwriter. He was replaced by John McEuen on banjo, fiddle, mandolin, and steel guitar. McEuen's older brother, William, was the group's manager, and he helped the band get signed with Liberty Records, which released the group's debut album, The Nitty Gritty Dirt Band during 1967. The band's first single, "Buy for Me the Rain," was a Top 40 success, and the band gained exposure on The Tonight Show Starring Johnny Carson, as well as concerts with such disparate artists as Jack Benny and The Doors. A second album, Ricochet, was released later during the year and was less successful than their first. Kunkel wanted the band to "go electric", and include more original material. Bruce left the group to form WordSalad and Of The People. He was replaced by multi-instrumentalist Chris Darrow. By 1968, the band adopted electrical instruments anyway, and added drums. The first electric album, Rare Junk, was a commercial failure, as was their next, Alive. The band continued to gain publicity, mainly as a novelty act, making an appearance in the 1968 film, For Singles Only, and a cameo appearance in the 1969 musical western film, Paint Your Wagon, performing "Hand Me Down That Can o' Beans". The band also played Carnegie Hall as an opening act for Bill Cosby and played in a jam session with Dizzy Gillespie.

Is there anything else significant that happened in the late 60's for the band?

By 1968, the band adopted electrical instruments anyway, and added drums.

Answer the question at the end by quoting:

Much of the information about the early years of Calamity Jane's life comes from the autobiographical booklet which she dictated in 1896, written for publicity purposes. She was about to begin a tour in which she appeared in dime museums around the United States, and it was intended to help attract audiences. Some of the information in the pamphlet is exaggerated or even completely inaccurate. Calamity Jane was born on May 1, 1852 as Martha Jane Canary (or Cannary) in Princeton, within Mercer County, Missouri.
Jane was involved in several campaigns in the long-running military conflicts with American Indians. Her claim was that: It was during this campaign [in 1872-73] that I was christened Calamity Jane. It was on Goose Creek, Wyoming where the town of Sheridan is now located. Capt. Egan was in command of the Post. We were ordered out to quell an uprising of the Indians, and were out for several days, had numerous skirmishes during which six of the soldiers were killed and several severely wounded. When on returning to the Post we were ambushed about a mile and a half from our destination. When fired upon Capt. Egan was shot. I was riding in advance and on hearing the firing turned in my saddle and saw the Captain reeling in his saddle as though about to fall. I turned my horse and galloped back with all haste to his side and got there in time to catch him as he was falling. I lifted him onto my horse in front of me and succeeded in getting him safely to the Fort. Capt. Egan on recovering, laughingly said: "I name you Calamity Jane, the heroine of the plains." I have borne that name up to the present time. Captain Jack Crawford served under Generals Wesley Merritt and George Crook. According to the Montana Anaconda Standard of April 19, 1904, he stated that Calamity Jane "never saw service in any capacity under either General Crook or General Miles. She never saw a lynching and never was in an Indian fight. She was simply a notorious character, dissolute and devilish, but possessed a generous streak which made her popular." It may be that she exaggerated this story, or even completely fabricated it. Even during her lifetime, not everyone accepted her version as true. A popular belief is that she instead acquired it as a result of her warnings to men that to offend her was to "court calamity". It is possible that "Jane" was not part of her name until the nickname was coined for her. It is certain, however, that she was known by that nickname by 1876, because the arrival of the Hickok wagon train was reported in Deadwood's newspaper the Black Hills Pioneer on July 15, 1876, with the headline: "Calamity Jane has arrived!" Another unverified story in her autobiographical pamphlet is that her detachment was ordered to the Big Horn River under General Crook in 1875. She swam the Platte River and travelled 90 miles (140 km) at top speed while wet and cold in order to deliver important dispatches. She became ill afterwards and spent a few weeks recuperating. She then rode to Fort Laramie in Wyoming and joined a wagon train headed north in July 1876. The second part of her story is verified. She was at Fort Laramie in July 1876, and she did join a wagon train that included Wild Bill Hickok. That was where she first met Hickok, contrary to her later claims, and that was how she happened to come to Deadwood.

Why was she given this nickname?
"I name you Calamity Jane, the heroine of the plains."