The President had been invited by the League of United Latin American Citizens to its fundraising ball at Houston's historic Rice Hotel.
The President had said he would attend, but the organizers were still surprised and relieved when Jacqueline & John Kennedy walked through the doors.
"He had a glow that is still so vivid in my mind," said Amparo Arroyos.
Shouts of "Viva Kennedy" arose in the grand ballroom as the President greeted many in the crowd.
National LULAC President John Herrera with President Kennedy and Lady Bird Johnson.
The President talks with Lady Bird Johnson as the Vice President looks on.
Some were told not to shake hands with the President in the receiving line, but many did anyway.
In their account of the evening, LULAC called the President "young, able and imaginative."
Debbie Briones and Lisa Herrera either before or after what would be a memorable moment in their lives.
Debbie Briones and Lisa Herrera presented flowers to the First Lady.
Lady Bird Johnson and the President enjoy a laugh.
Jacqueline Kennedy, the President, Vice President Johnson and Lady Bird Johnson all signed the guest book.
The President and First Lady were staying at the Rice Hotel. They stayed at the LULAC event for about 20 minutes.
"He turned to Jacqueline Kennedy and said 'I'm really having a good time tonight'," said Alex Arroyos.
Can you identify the signatures from the guest book that night?
Lady Bird Johnson
Vice President Lyndon Johnson
President John F. Kennedy
The mariachis "El Trio Internacional" played "Jacqueline" and "Kennedy, Kennedy", songs that had been composed for them on a trip to Mexico.
Vice President Johnson may have been making notes for his speech. In fewer than 24 hours, he would be sworn in as President.
Vice President Johnson was called "El Sabio del Rio Pedernales." "A wise person from the Pedernales river," referring to the part of Texas Johnson was from.
As he took to the stage, President Kennedy acknowledges the Mariachi band.
The President's speech was described in newspaper accounts as brief. He spoke for about four minutes.
The President spoke between 8:30 p.m. and 9 p.m., some 15 hours before his death in Dallas.
The President said the group "reminds America of the link with our sister republics in this hemisphere."
A LULAC newsletter said the President was interrupted with "enthusiasm" several times as he spoke. This unpublished photo was taken by Amparo Arroyos.
Some 700 guests welcomed the President and heard him speak.
He said "I'm going to ask my wife to say a few words tonight."
First lady Jacqueline Kennedy spoke in Spanish to the delight of those in the room.
"Estoy muy contenta de estar aqui," the First Lady said in Spanish. "I am very happy to be here."
Jacqueline Kennedy was described as being nervous about speaking in Spanish and remembering what she had to say.
Jacqueline Kennedy told the group in Spanish: "I'm very happy to be in the great state of Texas." This unpublished photo was taken by Amparo Arroyos.
Her speech was received to wild cheers and "Oles," according to those there that night. This unpublished photo was taken by Amparo Arroyos.
Jacqueline Kennedy was overheard saying to her husband, "Isn't this wonderful. It reminds me of Mexico City."
Security for the event was provided by Latino officers of the Houston police.
President Kennedy left the Rice Hotel for his official event of the evening, one honoring a local congressman.
iStock / evgenyb
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