diff --git a/src/app/(frontend)/intelligence/missions/actions.ts b/src/app/(frontend)/intelligence/missions/actions.ts
index b7617e7..5c74c9a 100644
--- a/src/app/(frontend)/intelligence/missions/actions.ts
+++ b/src/app/(frontend)/intelligence/missions/actions.ts
@@ -738,6 +738,70 @@ export async function cancelFridaySideOp(
   }
 }
 
+export async function markSideOpReady(
+  missionId: number,
+): Promise<ActionResult<{ missionId: number }>> {
+  try {
+    const { payload, user } = await authenticate();
+    const userId = user.id as number;
+
+    const mission = await payload.findByID({
+      collection: "missions",
+      id: missionId,
+      depth: 0,
+    });
+
+    const canManage = await hasPermission(payload, user, "missions:update");
+    if (!canManage && !isSideOpOwner(mission, userId)) {
+      return {
+        success: false,
+        error: "Only the player who scheduled this side operation can mark it Ready.",
+      };
+    }
+
+    const status = mission.ownershipAndStatus.status;
+    if (status === "Ready") {
+      return { success: true, data: { missionId: mission.id } };
+    }
+    if (!["Concept", "Planning", "Scheduled"].includes(status)) {
+      return {
+        success: false,
+        error:
+          status === "Active"
+            ? "This mission is already underway and cannot be marked Ready."
+            : `This mission is ${status.toLowerCase()} and can no longer be marked Ready.`,
+      };
+    }
+
+    const updated = await payload.update({
+      collection: "missions",
+      id: missionId,
+      depth: 0,
+      overrideAccess: true,
+      data: {
+        ownershipAndStatus: {
+          status: "Ready",
+        },
+      },
+    });
+
+    await emitGameEvent(payload, {
+      type: EventTypes.MissionReady,
+      message: `${user.displayName || user.username} marked side operation "${updated.name}" (${updated.codeName}) as Ready — details are locked in and the roll-call can be posted.`,
+      actor: userId,
+      targetCollection: "missions",
+      targetId: updated.id,
+    });
+
+    return { success: true, data: { missionId: updated.id } };
+  } catch (error) {
+    const message = error instanceof Error ? error.message : "Unknown error";
+    return message === "Unauthorized"
+      ? { success: false, error: "You must be logged in." }
+      : { success: false, error: message };
+  }
+}
+
 export async function moveFridaySideOpToCampaign(
   missionId: number,
   campaignId: number,
diff --git a/src/components/frontend/intelligence/SideOpControls.tsx b/src/components/frontend/intelligence/SideOpControls.tsx
index 8839521..fe9607d 100644
--- a/src/components/frontend/intelligence/SideOpControls.tsx
+++ b/src/components/frontend/intelligence/SideOpControls.tsx
@@ -3,10 +3,13 @@
 import { useState, useTransition } from "react";
 import { useRouter } from "next/navigation";
 import { toast } from "sonner";
-import { PencilIcon, XCircleIcon } from "lucide-react";
+import { CheckCircleIcon, PencilIcon, XCircleIcon } from "lucide-react";
 import { Item, ItemContent, ItemHeader, ItemTitle } from "@/components/ui/item";
 import { Button } from "@/components/ui/button";
-import { cancelFridaySideOp } from "@/app/(frontend)/intelligence/missions/actions";
+import {
+  cancelFridaySideOp,
+  markSideOpReady,
+} from "@/app/(frontend)/intelligence/missions/actions";
 import {
   CreateSideOpDialog,
   type SideOpDialogInitial,
@@ -34,6 +37,19 @@ export function SideOpControls({
   const [isPending, startTransition] = useTransition();
 
   const isTerminal = status === "Completed" || status === "Cancelled";
+  const canMarkReady = ["Concept", "Planning", "Scheduled"].includes(status);
+
+  function handleMarkReady() {
+    startTransition(async () => {
+      const result = await markSideOpReady(initial.missionId);
+      if (!result.success) {
+        toast.error(result.error ?? "Failed to mark the side operation as Ready.");
+        return;
+      }
+      toast.success("Side operation marked as Ready. Roll-call can now be posted.");
+      router.refresh();
+    });
+  }
 
   function handleCancel() {
     if (!confirmingCancel) {
@@ -64,6 +80,12 @@ export function SideOpControls({
       </ItemHeader>
       <ItemContent>
         <div className="flex flex-wrap gap-2">
+          {canMarkReady && (
+            <Button size="sm" variant="default" onClick={handleMarkReady} disabled={isPending}>
+              <CheckCircleIcon className="size-3.5" />
+              Mark as Ready
+            </Button>
+          )}
           <Button size="sm" variant="outline" onClick={() => setEditOpen(true)} disabled={isPending}>
             <PencilIcon className="size-3.5" />
             Edit
@@ -79,8 +101,9 @@ export function SideOpControls({
           </Button>
         </div>
         <p className="text-xs text-muted-foreground">
-          Editing covers details, campaign, and narrative. Cancelling frees your scheduling slot
-          and updates the Discord embed.
+          Marking the operation Ready locks in the details so the Discord roll-call can be posted
+          and the mission hooks delivered. Editing covers details, campaign, and narrative.
+          Cancelling frees your scheduling slot and updates the Discord embed.
         </p>
       </ItemContent>
 
diff --git a/src/utils/event-log/eventTypes.ts b/src/utils/event-log/eventTypes.ts
index 62588af..facc026 100644
--- a/src/utils/event-log/eventTypes.ts
+++ b/src/utils/event-log/eventTypes.ts
@@ -126,6 +126,7 @@ export const EventTypes = {
   MissionAutoComplete: "mission:auto-complete",
   MissionObjectiveRedactedToggle: "mission:objective-redacted-toggle",
   MissionSchedule: "mission:schedule",
+  MissionReady: "mission:ready",
   MissionUpdate: "mission:update",
   MissionCancel: "mission:cancel",
   MissionMoveCampaign: "mission:move-campaign",