diff --git a/src/lib.cpp b/src/lib.cpp
index 41f76e0..0a8ad8a 100644
--- a/src/lib.cpp
+++ b/src/lib.cpp
@@ -2,6 +2,7 @@
 
 #include "prep/prep.hh"
 
+#include <algorithm>
 #include <vector>
 
 enum VALIDATION_STATUS {
@@ -21,6 +22,10 @@ void run() {
     const Action vote = Action("vote", true);
     Role role1({vote, kill, heal});
     Role role2({heal});
+    Event event1 = Event("Event 1", 1710087364, 1, true, {vote}, {}, {});
+    Event event2 = Event("Event 2", 1710087364, 1, true, {}, {}, {kill});
+    Event event3 = Event("Event 3", 1710087364, 1, true, {}, {kill}, {});
+    std::vector<Event> relatedEvents({event1, event3});
 }
 
 int validateAction(
@@ -41,7 +46,7 @@ int validateAction(
     if (!actionBelongsToRole(role, action)) {
         return ACTION_NOT_ALLOWED;
     }
-    if (!isActionAllowed(relatedEvents)) {
+    if (!isActionAllowed(action, relatedEvents)) {
         return ACTION_PROHIBITED;
     }
     return ACTION_VALID;
@@ -53,9 +58,18 @@ bool actionBelongsToRole(Role *role, Action *action) {
     return belongs;
 }
 
-bool isActionAllowed(std::vector<Event> *relevantEvents) {
-    // TODO: implement
+bool isActionAllowed(Action *action, std::vector<Event> *relevantEvents) {
+    // actions are disabled by default
     bool allowed = false;
+    std::sort(relevantEvents->begin(), relevantEvents->end());
+    for (auto &event : *relevantEvents) {
+        if (std::find(event.prohibits.begin(), event.prohibits.end(), *action) != event.prohibits.end()) {
+            allowed = false;
+        }
+        if (std::find(event.allows.begin(), event.allows.end(), *action) != event.allows.end()) {
+            allowed = true;
+        }
+    }
     return allowed;
 }
 
diff --git a/src/lib.hh b/src/lib.hh
index 440093d..098de38 100644
--- a/src/lib.hh
+++ b/src/lib.hh
@@ -3,6 +3,6 @@
 void run();
 
 bool actionBelongsToRole(Role *role, Action *action);
-bool isActionAllowed(std::vector<Event> *relevantEvents);
+bool isActionAllowed(Action *action, std::vector<Event> *relevantEvents);
 int validateAction(Player *actor, Action *action, Room *room, std::vector<Event> *relatedEvents, Player *target);
 int functionToTest(int);
diff --git a/src/prep/prep.cpp b/src/prep/prep.cpp
index 7c2453d..f64a478 100644
--- a/src/prep/prep.cpp
+++ b/src/prep/prep.cpp
@@ -13,6 +13,10 @@ Action::Action(std::string name, bool hasTarget) {
     this->hasTarget = hasTarget;
 }
 
+bool Action::operator==(const Action &other) const {
+    return this->name == other.name;
+}
+
 Role::Role(std::initializer_list<Action> actions) {
     for (auto &a : actions) {
         this->actions.push_back(a);
@@ -77,3 +81,15 @@ Event::Event(std::string title,
           std::vector<Action>(allows)) {
     this->utcTimestampCreatedAt = createUTCTimestamp(utcTimestampCreatedAt);
 }
+
+bool Event::operator<(const Event &right) const {
+    return this->utcTimestampCreatedAt < right.utcTimestampCreatedAt;
+}
+
+bool Event::operator==(const Event &right) const {
+    return this->utcTimestampCreatedAt == right.utcTimestampCreatedAt;
+}
+
+bool Event::operator>(const Event &right) const {
+    return this->utcTimestampCreatedAt > right.utcTimestampCreatedAt;
+}
diff --git a/src/prep/prep.hh b/src/prep/prep.hh
index 6ba1ee2..d4153a9 100644
--- a/src/prep/prep.hh
+++ b/src/prep/prep.hh
@@ -42,6 +42,7 @@ struct Action {
     bool hasTarget;
 
     Action(std::string name, bool hasTarget);
+    bool operator==(const Action &other) const;
 };
 
 struct Role {
@@ -77,6 +78,10 @@ struct Event {
     std::vector<Action> prohibits;
     std::vector<Action> allows;
 
+    bool operator<(const Event &other) const;
+    bool operator==(const Event &other) const;
+    bool operator>(const Event &other) const;
+
     Event(std::string title,
           uint32_t utcTimestampCreatedAt,
           uint32_t numberNight,