The gathering, which began with excitement and applause, soon turned tense as sections of the crowd began chanting loudly, interrupting his brief speech.
Gachagua, who had taken the stage to speak about unity and development, appeared momentarily unsettled as the noise grew louder, forcing him to cut his remarks short.
Witnesses say the chants reflected frustration among locals who felt their concerns had not been adequately addressed by national leaders.
Despite efforts by event organizers and local leaders to calm the situation, the uproar continued, prompting Gachagua to end his speech prematurely and leave the venue under tight security.
Political observers view the incident as a sign of shifting political moods in Mount Kenya, where the former deputy president once enjoyed strong support.
The episode has sparked debate over his current influence in the region and the broader political realignments taking shape ahead of future elections.
Gachagua has yet to issue an official statement about the incident, which has since drawn wide public reaction.