CRAWFORD, Texas (CNN) --

Jenna Bush is set to marry Henry Hager during a ceremony Saturday on the Bush family ranch in Texas.

1 of 2 "I had to face some very difficult spending decisions and I've had to conduct sensitive diplomacy. That's called planning for a wedding," Bush told the Hispanic Chamber of Commerce on March 12.

The plans are largely under wraps, but they call for gathering by a lake in front of an altar and four-foot high cross made from Texas limestone.

"This is the time when the wildflowers are all blooming. And I think it will be a very, very lovely wedding, and it will be very like Jenna and Henry," first lady Laura Bush recently said.

Jenna Bush told CNN's Larry King on April 24 that the wedding will include "all relatives, our families, really, kind of big. So it's half-family and then half-very close friends." More wedding details »

Not all of her friends will be on hand though.

"The only information that I've received is that there are a number of Jenna's close friends who are not being invited to this wedding because, according to them, she would be afraid of their behavior," said Doug Wead.

He says unlike the pageantry of White House weddings past, such as Tricia Nixon's in 1971, the Texas ceremony will take place away from the media spotlight.

"The Bushes are very private. It's a time of war, it's at a time of economic struggle. ... And this president has high negatives right now ... it's much more of a low-key event," Wead said. Listen to President Bush's radio address on his daughter's wedding »

Wedding facts
Bride: Jenna Welch Bush

Groom: Henry Chase Hager

Place: President Bush's Prairie Chapel Ranch, Crawford, Texas

Guests: More than 200 friends and relatives

Attendants: 14 women known as members of the "house party," not bridesmaids

Bride's gown designer: Oscar de la Renta

Ring: The diamond, a Hager family heirloom, reset in a ring that also features sapphires

Maid of Honor: Jenna's twin sister, Barbara

Ceremony site: At a cross made of beige Texas limestone erected near a lake on the ranch

Engagement: August 15, 2007, at Acadia National Park in Maine
Source: The Associated Press
Wead said another consideration for the wedding's location is "they know that they don't own the White House, that they can't go back.

"It will belong to Barack Obama or Hillary Clinton or John McCain. ... but they [Jenna and Henry] will always have Crawford. They won't even maybe have Kennebunkport, that hasn't been decided yet. ... But Crawford, Jenna and Henry can walk through the moonlight and hold hands and say 'This is where we were married,' and it will always be theirs," Wead added.

The first lady's office is keeping a tight lid on specifics. But the bride did reveal dress details to Vogue Magazine, describing her gown as an Oscar de la Renta creation made of organza with embroidery and beading. Watch as the first lady details the wedding plans »

"I'm very, very excited. It's a very interesting passage of life when you get to that time in your life when your child, first child is getting married -- and we're getting, for us, our first son," Laura Bush said on May 5.

And already, the first lady is joking about names for possible grandchildren down the road.

"George or Georgia ... Georgina. Georgette," she said.

As for the event itself, the ceremony gets under way in the evening hours in order to spare guests from the searing Texas heat.

The forecast for wedding weather calls for 92 degrees Fahrenheit, but only a slight chance of rain.