diff --git a/src/app.py b/src/app.py
index 4ebb1d9..f627fa3 100644
--- a/src/app.py
+++ b/src/app.py
@@ -38,6 +38,45 @@
         "schedule": "Mondays, Wednesdays, Fridays, 2:00 PM - 3:00 PM",
         "max_participants": 30,
         "participants": ["john@mergington.edu", "olivia@mergington.edu"]
+    },
+    # Sports activities
+    "Soccer Team": {
+        "description": "Join the school soccer team and compete in local leagues",
+        "schedule": "Tuesdays and Thursdays, 4:00 PM - 5:30 PM",
+        "max_participants": 22,
+        "participants": ["lucas@mergington.edu", "mia@mergington.edu"]
+    },
+    "Basketball Club": {
+        "description": "Practice basketball skills and play friendly matches",
+        "schedule": "Wednesdays, 3:30 PM - 5:00 PM",
+        "max_participants": 15,
+        "participants": ["liam@mergington.edu", "ava@mergington.edu"]
+    },
+    # Artistic activities
+    "Art Club": {
+        "description": "Explore painting, drawing, and other visual arts",
+        "schedule": "Mondays, 3:30 PM - 5:00 PM",
+        "max_participants": 18,
+        "participants": ["noah@mergington.edu", "isabella@mergington.edu"]
+    },
+    "Drama Society": {
+        "description": "Participate in theater productions and acting workshops",
+        "schedule": "Thursdays, 4:00 PM - 5:30 PM",
+        "max_participants": 25,
+        "participants": ["amelia@mergington.edu", "jack@mergington.edu"]
+    },
+    # Intellectual activities
+    "Math Olympiad": {
+        "description": "Prepare for math competitions and solve challenging problems",
+        "schedule": "Fridays, 2:00 PM - 3:30 PM",
+        "max_participants": 16,
+        "participants": ["charlotte@mergington.edu", "benjamin@mergington.edu"]
+    },
+    "Science Club": {
+        "description": "Conduct experiments and explore scientific concepts",
+        "schedule": "Wednesdays, 4:00 PM - 5:00 PM",
+        "max_participants": 20,
+        "participants": ["elijah@mergington.edu", "harper@mergington.edu"]
     }
 }
 
@@ -62,6 +101,26 @@ def signup_for_activity(activity_name: str, email: str):
     # Get the specific activity
     activity = activities[activity_name]
 
-    # Add student
+# Validate student is not already signed up
+    if email in activity["participants"]:
+        raise HTTPException(status_code=400, detail="Already signed up for this activity")
+
+    # Check if max participants reached
+    if len(activity["participants"]) >= activity["max_participants"]:
+        raise HTTPException(status_code=400, detail="Activity is full")
+
+    # Add student to participants
     activity["participants"].append(email)
     return {"message": f"Signed up {email} for {activity_name}"}
+
+
+@app.post("/activities/{activity_name}/unregister")
+def unregister_from_activity(activity_name: str, email: str):
+    """Unregister a student from an activity"""
+    if activity_name not in activities:
+        raise HTTPException(status_code=404, detail="Activity not found")
+    activity = activities[activity_name]
+    if email not in activity["participants"]:
+        raise HTTPException(status_code=400, detail="Participant not found in this activity")
+    activity["participants"].remove(email)
+    return {"message": f"Unregistered {email} from {activity_name}"}
diff --git a/src/static/app.js b/src/static/app.js
index dcc1e38..1873c42 100644
--- a/src/static/app.js
+++ b/src/static/app.js
@@ -20,11 +20,32 @@ document.addEventListener("DOMContentLoaded", () => {
 
         const spotsLeft = details.max_participants - details.participants.length;
 
+        // Create participants list HTML
+        let participantsHTML = "";
+        if (details.participants.length > 0) {
+          participantsHTML = `
+            <div class="participants-section">
+              <strong>Participants:</strong>
+              <ul class="participants-list">
+                ${details.participants.map(p => `<li><span class="participant-email">${p}</span> <span class="delete-participant" title="Unregister" data-activity="${name}" data-email="${p}">🗑️</span></li>`).join("")}
+              </ul>
+            </div>
+          `;
+        } else {
+          participantsHTML = `
+            <div class="participants-section">
+              <strong>Participants:</strong>
+              <span class="no-participants">No participants yet</span>
+            </div>
+          `;
+        }
+
         activityCard.innerHTML = `
           <h4>${name}</h4>
           <p>${details.description}</p>
           <p><strong>Schedule:</strong> ${details.schedule}</p>
           <p><strong>Availability:</strong> ${spotsLeft} spots left</p>
+          ${participantsHTML}
         `;
 
         activitiesList.appendChild(activityCard);
@@ -81,6 +102,29 @@ document.addEventListener("DOMContentLoaded", () => {
     }
   });
 
+  // Add event listener for delete icons
+  activitiesList.addEventListener("click", async (event) => {
+    if (event.target.classList.contains("delete-participant")) {
+      const activity = event.target.getAttribute("data-activity");
+      const email = event.target.getAttribute("data-email");
+      if (confirm(`Unregister ${email} from ${activity}?`)) {
+        try {
+          const response = await fetch(`/activities/${encodeURIComponent(activity)}/unregister?email=${encodeURIComponent(email)}`, {
+            method: "POST"
+          });
+          if (!response.ok) {
+            const data = await response.json();
+            alert(data.detail || "Failed to unregister participant.");
+          } else {
+            fetchActivities();
+          }
+        } catch (error) {
+          alert("Error unregistering participant.");
+        }
+      }
+    }
+  });
+
   // Initialize app
   fetchActivities();
 });
diff --git a/src/static/styles.css b/src/static/styles.css
index a533b32..e722f8c 100644
--- a/src/static/styles.css
+++ b/src/static/styles.css
@@ -63,6 +63,7 @@ section h3 {
   border: 1px solid #ddd;
   border-radius: 5px;
   background-color: #f9f9f9;
+  position: relative;
 }
 
 .activity-card h4 {
@@ -74,6 +75,46 @@ section h3 {
   margin-bottom: 8px;
 }
 
+.participants-section {
+  margin-top: 12px;
+  padding: 10px;
+  background-color: #eef2fa;
+  border-radius: 4px;
+  border: 1px solid #c5cae9;
+}
+
+.participants-section strong {
+  color: #3949ab;
+  display: block;
+  margin-bottom: 5px;
+}
+
+.participants-list {
+  margin: 0 0 0 18px;
+  padding: 0;
+  list-style-type: none; /* Hide bullet points */
+  color: #333;
+  font-size: 15px;
+}
+
+.delete-participant {
+  cursor: pointer;
+  color: #c62828;
+  margin-left: 8px;
+  font-size: 16px;
+  vertical-align: middle;
+  transition: color 0.2s;
+}
+.delete-participant:hover {
+  color: #a31515;
+}
+
+.no-participants {
+  color: #888;
+  font-style: italic;
+  margin-left: 5px;
+}
+
 .form-group {
   margin-bottom: 15px;
 }