How can I get it so when a button is clicked, it switches to a page for a tab?

Well first of all, my eyes do crying when i see all the hard-coded stuff, what do i mean ? ? ?

You are coding every single step of your code in hard-coded code-lines.

Why not coding much more → DYNAMICALLY <— ???

Your code…

$w('#horizontalMenu2').onItemClick((event)=> {console.log('Clicked-ID: ', event.target.id);
   		let label = event.item.label;  console.log('Label: ', label);

		if(label === 'Organization Committee') {console.log('You clicked Organization Committee');
			let tabValue = "Organization";
			local.setItem("tab", tabValue);
			wixLocationFrontend.to("/main-street-approach#section22");
		}
		else if(label === 'Design Committee') {console.log('You clicked Design Committee');
			let tabValue = "Design";
			local.setItem("tab", tabValue);
			wixLocationFrontend.to("/main-street-approach#section22");
		}
		else if(label === 'Promotions Committee') {console.log('You clicked Promotions Committee');
			let tabValue = "Promotions";
			local.setItem("tab", tabValue);
			wixLocationFrontend.to("/main-street-approach#section22");
		}
		else if(label === 'Economic Vitality Committee') {console.log('You clicked Economic Vitality Committee');
			let tabValue = "Economic Vitality";
			local.setItem("tab", tabValue);
			wixLocationFrontend.to("/main-street-approach#section22");
		}
	});

My approach…

const tabMapping = {
  'Organization Committee': 'Organization',
  'Design Committee': 'Design',
  'Promotions Committee': 'Promotions',
  'Economic Vitality Committee': 'Economic Vitality'
};

$w('#horizontalMenu2').onItemClick((event) => {
  const label = event.item.label;
  const tabValue = tabMapping[label];

  if (tabValue) {
    console.log(`You clicked ${label}`);
    local.setItem("tab", tabValue);
    wixLocationFrontend.to("/main-street-approach#section22");
  } else {
    console.log('Unknown label: ', label);
  }
});

Upgraded approach…

const menuItems = $w('#horizontalMenu2').items;
const getTabValueFromLabel = (label) => {
   const words = label.split(' ');
   const committeeIndex = words.indexOf('Committee');
   if (committeeIndex > 0) {
     return words.slice(0, committeeIndex).join(' ');
   } return null;
};

$w('#horizontalMenu2').onItemClick((event) => {
   const label = event.item.label;
   const tabValue = getTabValueFromLabel(label);

   if (tabValue) {console.log(`You clicked ${label}`);
     local.setItem("tab", tabValue);
     wixLocationFrontend.to("/main-street-approach#section22");
   } else { console.log('Unknown label or no special action required: ', label);}
});

About your issue…since your setup is very similar to this topic/post…

…maybe you should take a look onto it…