diff --git a/caimira/apps/calculator/__init__.py b/caimira/apps/calculator/__init__.py
index b2a0e051..be8de7ab 100644
--- a/caimira/apps/calculator/__init__.py
+++ b/caimira/apps/calculator/__init__.py
@@ -42,7 +42,7 @@ from .user import AuthenticatedUser, AnonymousUser
 # calculator version. If the calculator needs to make breaking changes (e.g. change
 # form attributes) then it can also increase its MAJOR version without needing to
 # increase the overall CAiMIRA version (found at ``caimira.__version__``).
-__version__ = "4.15.0"
+__version__ = "4.15.1"
 
 LOG = logging.getLogger("Calculator")
 
@@ -294,6 +294,11 @@ class LandingPage(BaseRequestHandler):
 
 class CalculatorForm(BaseRequestHandler):
     def get(self):
+        data_registry: DataRegistry = self.settings["data_registry"]
+        data_service: typing.Optional[DataService] = self.settings.get("data_service", None)
+        if data_service:
+            data_service.update_registry(data_registry)
+
         template_environment = self.settings["template_environment"]
         template = template_environment.get_template(
             "calculator.form.html.j2")
@@ -304,6 +309,7 @@ class CalculatorForm(BaseRequestHandler):
             get_calculator_url = template.globals["get_calculator_url"],
             calculator_version=__version__,
             text_blocks=template_environment.globals["common_text"],
+            data_registry=data_registry.to_dict(),
         )
         self.finish(report)
 
diff --git a/caimira/apps/templates/base/calculator.form.html.j2 b/caimira/apps/templates/base/calculator.form.html.j2
index 3344183b..6842ea63 100644
--- a/caimira/apps/templates/base/calculator.form.html.j2
+++ b/caimira/apps/templates/base/calculator.form.html.j2
@@ -506,18 +506,12 @@
     <div class="col-sm-4"><label class="col-form-label">Activity type:</label></div>
     <div class="col-sm-6">
       <select id="activity_type" name="activity_type" class="form-control">
-        <option value="office">Office</option>
-        <option value="smallmeeting">Small meeting (<10 occ.)</option>
-        <option value="largemeeting">Large meeting (>=10 occ.)</option>
-        <option value="callcentre">Call Centre</option>
-        <option value="controlroom-day">Control Room - Day shift</option>
-        <option value="controlroom-night">Control Room - Night shift</option>
-        <option value="library">Library</option>
-        <option value="lab">Laboratory</option>
-        <option value="workshop">Workshop</option>
-        <option value="training">Conference/Training (speaker infected)</option>
-        <option value="training_attendee">Conference/Training (attendee infected)</option>
-        <option value="gym">Gym</option>
+        {% for activity_type_key, activity_type_value in data_registry.population_scenario_activity.items() %}
+          {% if activity_type_key not in ["precise", "household-day", "household-night", "primary-school", 
+                                          "secondary-school", "university", "restaurant"] %}
+              <option value="{{ activity_type_key }}">{{ activity_type_value['placeholder'] }}</option>
+          {% endif %}
+      {% endfor %}
       </select>
     </div>
     </div>
diff --git a/caimira/store/data_registry.py b/caimira/store/data_registry.py
index 5e708fd2..e1074587 100644
--- a/caimira/store/data_registry.py
+++ b/caimira/store/data_registry.py
@@ -389,63 +389,84 @@ class DataRegistry:
     }
     monte_carlo_sample_size = 250000
     population_scenario_activity = {
-        "office": {"activity": "Seated", "expiration": {"Speaking": 1, "Breathing": 2}},
+        "office": {"placeholder": "Office", "activity": "Seated", "expiration": {"Speaking": 1, "Breathing": 2}},
         "smallmeeting": {
+            "placeholder": "Small meeting (<10 occ.)",
             "activity": "Seated",
             "expiration": {"Speaking": 1},
         },
         "largemeeting": {
+            "placeholder": "Large meeting (>= 10 occ.)",
             "activity": "Standing",
             "expiration": {"Speaking": 1, "Breathing": 2},
         },
-        "callcenter": {"activity": "Seated", "expiration": {"Speaking": 1}},
+        "callcenter": {"placeholder": "Call Center", "activity": "Seated", "expiration": {"Speaking": 1}},
         "controlroom-day": {
+            "placeholder": "Control Room - Day shift",
             "activity": "Seated",
             "expiration": {"Speaking": 1, "Breathing": 1},
         },
         "controlroom-night": {
+            "placeholder": "Control Room - Night shift",
             "activity": "Seated",
             "expiration": {"Speaking": 1, "Breathing": 9},
         },
-        "library": {"activity": "Seated", "expiration": {"Breathing": 1}},
+        "library": {"placeholder": "Library", "activity": "Seated", "expiration": {"Breathing": 1}},
         "lab": {
+            "placeholder": "Lab",
             "activity": "Light activity",
             "expiration": {"Speaking": 1, "Breathing": 1},
         },
         "workshop": {
+            "placeholder": "Workshop",
             "activity": "Moderate activity",
             "expiration": {"Speaking": 1, "Breathing": 1},
         },
-        "training": {"activity": "Standing", "expiration": {"Speaking": 1}},
-        "training_attendee": {"activity": "Seated", "expiration": {"Breathing": 1}},
-        "gym": {"activity": "Heavy exercise", "expiration": {"Breathing": 1}},
+        "training": {"placeholder": "Conference/Training (speaker infected)", "activity": "Standing", "expiration": {"Speaking": 1}},
+        "training_attendee": {"placeholder": "Conference/Training (attendee infected)", "activity": "Seated", "expiration": {"Breathing": 1}},
+        "gym": {"placeholder": "Gym", "activity": "Heavy exercise", "expiration": {"Breathing": 1}},
         "household-day": {
+            "placeholder": "Household (day time)",
             "activity": "Light activity",
             "expiration": {"Breathing": 5, "Speaking": 5},
         },
         "household-night": {
+            "placeholder": "Household (evening and night time)",
             "activity": "Seated",
             "expiration": {"Breathing": 7, "Speaking": 3},
         },
         "primary-school": {
+            "placeholder": "Primary school",
             "activity": "Light activity",
             "expiration": {"Breathing": 5, "Speaking": 5},
         },
         "secondary-school": {
+            "placeholder": "Primary school",
             "activity": "Light activity",
             "expiration": {"Breathing": 7, "Speaking": 3},
         },
         "university": {
+            "placeholder": "University",
             "activity": "Seated",
             "expiration": {"Breathing": 9, "Speaking": 1},
         },
         "restaurant": {
+            "placeholder": "Restaurant",
             "activity": "Seated",
             "expiration": {"Breathing": 1, "Speaking": 9},
         },
-        "precise": {"activity": "", "expiration": {}},
+        "precise": {"placeholder": "Precise", "activity": "", "expiration": {}},
     }
 
+    def to_dict(self):
+        # Filter out methods, special attributes, and non-serializable objects
+        data_dict = {
+            key: value
+            for key, value in self.__class__.__dict__.items()
+            if not key.startswith("__") and not callable(value) and not isinstance(value, (type, classmethod, staticmethod))
+        }
+        return data_dict
+
     def update(self, data, version=None):
         """Update local cache with data provided as argument."""
         for attr_name, value in data.items():