The festivities were in high gear.

Meaning

The celebrations were at their most intense and exciting point.

Examples

• John: 'The wedding reception was amazing!'
• Alice: 'Yes, <b>the festivities were in high gear</b> all night long.'
• John: 'Me too! <b>The festivities were in high gear</b> by the evening.'
• Alice: 'I loved the atmosphere at the festival.'