Resolved questions
what does "demonstrations" here mean?

【The President and Mrs. Kennedy mounted the ramp at 11:23. Evelyn Lincoln photographed them with a new Polaroid and followed, brushing past Mac Kilduff. Kilduff was lost in thought. "I'll be glad when this next stop is over,' he said under his breath. "It's the only one that worries me." Sitting beside Mary Gallagher, Evelyn suggested to her, "Why don't you come along on the Dallas motorcade?" Mary shook her head. "Can't! I've already missed two hotels." Evelyn persisted: "Remember Adlai Stevenson? We may run into some demonstrations." "Demonstrations?" Mary asked skittishly. Yet it sounded exciting, and she decided to take a chance and go. After all, she had worked for the Kennedys for nearly eleven years. She was entitled to a little fun. She just hoped the President didn't find out.】

does "demonstrations" here mean " march protesting against or supporting sb/sth ", or" A display is often for public entertainment "