diff --git a/events.js b/events.js
index 340427e..607cace 100644
--- a/events.js
+++ b/events.js
@@ -1,14 +1,22 @@
 // Configuration of periodic events in CoBiE time
-// Each event repeats every cosmocycle.
-// "cobie" is the timestamp within the cosmocycle when the event occurs.
-// "tag" is a short label that will be displayed on the calendar.
+// Each object describes when the event occurs and how often it repeats.
+//
+// Fields:
+//   start    - CoBiE timestamp when the first occurrence happens.
+//   end      - optional CoBiE timestamp after which the event stops.
+//   unit     - the unit of the recurrence ("second", "xenocycle", "quantic",
+//              "chronon", "eonstrip", "megasequence", "cosmocycle", ...).
+//   interval - how many units between occurrences (1 = every unit,
+//              2 = every second unit, ...).
+//   label    - short description displayed on the calendar.
+//   duration - optional length of the event in seconds.
 
 window.SPECIAL_EVENTS = [
-  { cobie: '49f4.9332', label: 'Afina',        megasequence: 'Mythran Epoch', eonstrip: 'Ventaso' },
-  { cobie: '11e5.f552', label: 'Oleks',        megasequence: 'Umbral Echo',   eonstrip: 'Ignisar' },
-  { cobie: '4d07.a2b2', label: 'Vincent',      megasequence: 'Azurean Tide',  eonstrip: 'Floraen' },
-  { cobie: '3edc.d430', label: 'Hochzeitstag', megasequence: 'Lustran Bounty', eonstrip: 'Electros' },
-  { cobie: '330d.d4ae', label: 'Zusammentag',  megasequence: 'Azurean Tide',  eonstrip: 'Chronar' },
-  { cobie: '11de.0c52', label: 'Anna',         megasequence: 'Lustran Bounty', eonstrip: 'Radiantae' },
-  { cobie: '467f.ae61', label: 'Iris',         megasequence: 'Argent Veil',   eonstrip: 'Etherion' }
+  { start: '49f4.9332', label: 'Afina',        unit: 'cosmocycle', interval: 1 },
+  { start: '11e5.f552', label: 'Oleks',        unit: 'cosmocycle', interval: 1 },
+  { start: '4d07.a2b2', label: 'Vincent',      unit: 'cosmocycle', interval: 1 },
+  { start: '3edc.d430', label: 'Hochzeitstag', unit: 'cosmocycle', interval: 1 },
+  { start: '330d.d4ae', label: 'Zusammentag',  unit: 'cosmocycle', interval: 1 },
+  { start: '11de.0c52', label: 'Anna',         unit: 'cosmocycle', interval: 1 },
+  { start: '467f.ae61', label: 'Iris',         unit: 'cosmocycle', interval: 1 }
 ];
diff --git a/script.js b/script.js
index 9c5fdde..9d52079 100644
--- a/script.js
+++ b/script.js
@@ -613,13 +613,32 @@ function updateCalendar() {
             </div>`;
 
         if (Array.isArray(window.SPECIAL_EVENTS)) {
-            const offsetStart = ((cellCob % COBIE_UNITS.cosmocycle) + COBIE_UNITS.cosmocycle) % COBIE_UNITS.cosmocycle;
-            const offsetEnd = offsetStart + COBIE_UNITS.eonstrip;
+            const cellStart = cellCob;
+            const cellEnd = cellCob + COBIE_UNITS.eonstrip;
             window.SPECIAL_EVENTS.forEach(ev => {
-                const evCob = parseCobiets(ev.cobie);
-                if (evCob === null) return;
-                const evOffset = ((evCob % COBIE_UNITS.cosmocycle) + COBIE_UNITS.cosmocycle) % COBIE_UNITS.cosmocycle;
-                if (evOffset >= offsetStart && evOffset < offsetEnd) {
+                const startCob = parseCobiets(ev.start || ev.cobie);
+                if (startCob === null) return;
+                const endCob = ev.end ? parseCobiets(ev.end) : Number.POSITIVE_INFINITY;
+                const unitVal = COBIE_UNITS[ev.unit] || COBIE_UNITS.cosmocycle;
+                const interval = (ev.interval || 1) * unitVal;
+                let duration = 0;
+                if (typeof ev.duration === 'string') {
+                    const d = parseCobiets(ev.duration);
+                    if (d !== null) duration = d;
+                } else if (typeof ev.duration === 'number') {
+                    duration = ev.duration;
+                }
+
+                if (cellStart > endCob) return;
+
+                let n = Math.floor((cellStart - startCob) / interval);
+                if (n < 0) n = 0;
+                let occ = startCob + n * interval;
+                if (occ + duration <= cellStart) {
+                    occ += interval;
+                }
+
+                if (occ < cellEnd && occ + duration > cellStart && occ <= endCob) {
                     const tag = document.createElement('div');
                     tag.className = 'event-tag';
                     tag.textContent = ev.label;