CAPE CANAVERAL, Fla. -- It's rodeo round up day aboard the old frontier outpost.

STS-110

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With BBQ meat, corn, new denim shirts and a few surprises, the crew of shuttle Atlantis plan to host an orbital version of the 2002 Houston Livestock Show and Rodeo Friday night for the Expedition Four crew of Yuri Onufrienko, Dan Bursch and Carl Walz.

Such is the importance to Houston residents of the event that even the quietist engineers at the Johnson Space Center have been known to become 10-gallon-hat, cowboy-boots wearing ranch hand wannabe's.

So because the station crew missed the rodeo when it was held Feb. 12 to March 3, the Atlantis astronauts wanted to bring a little hometown flavor to the station's perch some 240 miles above Earth.

"It's about the time of the rodeo here," Atlantis commander Mike Bloomfield said before the flight, "and both Dan and Carl enjoy the rodeo. So we're taking up some barbecue beef and we're taking up some handkerchiefs, and (mission specialist) Jerry (Ross) is a country western fan so he's going to bring some music and we're going to try and have our own little party up there."

Having completed the toughest day of their assembly mission on Thursday when they attached the S-Zero truss and hosted the first of four planned spacewalks, the crew transferred some experiments and supplies between the shuttle and station early Friday before taking a half-day off to relax and spend some quality time together.

"We've been awful busy the last couple of days and we've sort of been eating at odd times, trying to keep up with the work," station flight engineer Walz told CBS News during a space-to-ground interview on Friday. "But we're looking forward to a little time to relax together before the next couple of (spacewalks)."

Another option for spending time off: watching DVD movies on a laptop computer.

Bursch said Friday the Expedition Four station crew has onboard a complete set of "Alien" movies starring Sigourney Weaver, and Bursch dutifully offered his critique of the series.

"I kind of thought the best one was the first one, and they kind of went downhill from there," Bursh said.

Meanwhile, the hectic pace aboard space station Alpha will resume Saturday when Ross and rookie spacewalker Lee Morin are to depart the station's Quest airlock for another seven-hour sortie to continue installing the 13-ton S-Zero truss to the Destiny science module.

The 44.2-foot (13.5-meter) long truss segment is the centerpiece to a new station beam which, when additional sections are added during the next two years, will stretch more than the length of a football field.

Picking up where shuttle spacewalkers Steve Smith and Rex Walheim left off on Thursday, the second pair of spacewalkers will bolt two more weight-bearing struts to Destiny and connect additional power and data transfer cables.

The complete installation job won't be finished until after a fourth spacewalk concludes Tuesday, after both sets of spacewalkers get a second turn to work outside.

For Ross, NASA's most experienced spacewalker, the chance to work outside on something as important as the international complex will be a highlight of his record-breaking seventh spaceflight.

"I think it's the idea that you're a human being outside in your own little spacecraft, and you're using your own intelligence and your own hands to do things that are so incredible and so important for the future of mankind," Ross said Friday. "Add to that the beauty of what you're doing and the incredible sights -- a sunrise or a sunset every 45 minutes -- and the fact that you're going across the surface of the Earth at such a great clip that if you blink or look away for too long you'll miss entire continents."

Saturday's spacewalk is scheduled to begin about 10:33 a.m. EDT (1433 GMT) and will be broadcast live on NASA TV.

Atlantis is to remain docked to the space station until Wednesday and is scheduled to return to Earth April 19, landing back at the Kennedy Space Center about 12:45 p.m. EDT (1645 GMT).