diff --git a/app/features/calendar/actions/calendar.new.server.ts b/app/features/calendar/actions/calendar.new.server.ts
index dcc32868f..c3f05edf0 100644
--- a/app/features/calendar/actions/calendar.new.server.ts
+++ b/app/features/calendar/actions/calendar.new.server.ts
@@ -44,6 +44,7 @@ export const action: ActionFunction = async ({ request }) => {
 
 	const isEditing = Boolean(data.eventToEditId);
 	const isAddingTournament = data.toToolsEnabled;
+	const isTournamentAdder = user.roles.includes("TOURNAMENT_ADDER");
 	const organizationId = data.organizationId
 		? Number(data.organizationId)
 		: null;
@@ -52,7 +53,7 @@ export const action: ActionFunction = async ({ request }) => {
 		await validateOrganization({
 			userId: user.id,
 			organizationId,
-			isTournamentAdder: user.roles.includes("TOURNAMENT_ADDER"),
+			isTournamentAdder,
 		});
 	} else if (!isEditing) {
 		requireRole(
@@ -141,7 +142,10 @@ export const action: ActionFunction = async ({ request }) => {
 				"Tournament has already started",
 			);
 
-			errorToastIfFalsy(tournament.isAdmin(user), "Not authorized");
+			errorToastIfFalsy(
+				tournament.canEditEventInfo(user, { isTournamentAdder }),
+				"Not authorized",
+			);
 
 			// once published, a tournament can't be flipped back to draft
 			if (!tournament.isDraft) {
diff --git a/app/features/tournament-admin/routes/to.$id.admin.tsx b/app/features/tournament-admin/routes/to.$id.admin.tsx
index 6fc336aeb..11f9934e9 100644
--- a/app/features/tournament-admin/routes/to.$id.admin.tsx
+++ b/app/features/tournament-admin/routes/to.$id.admin.tsx
@@ -23,6 +23,7 @@ import { Redirect } from "~/components/Redirect";
 import { DANGEROUS_CAN_ACCESS_DEV_CONTROLS } from "~/features/admin/core/dev-controls";
 import { useUser } from "~/features/auth/core/user";
 import { useTournament } from "~/features/tournament/routes/to.$id";
+import { useHasRole } from "~/modules/permissions/hooks";
 import {
 	calendarEventPage,
 	tournamentAdminPage,
@@ -42,6 +43,7 @@ export default function TournamentAdminLayout() {
 	const tournament = useTournament();
 	const outletContext = useOutletContext();
 	const user = useUser();
+	const isTournamentAdder = useHasRole("TOURNAMENT_ADDER");
 	const location = useLocation();
 
 	const showReopen = Boolean(
@@ -73,7 +75,8 @@ export default function TournamentAdminLayout() {
 
 	return (
 		<div className={clsx("stack lg", containerClassName("wide"))}>
-			{tournament.isAdmin(user) && !tournament.hasStarted ? (
+			{tournament.canEditEventInfo(user, { isTournamentAdder }) &&
+			!tournament.hasStarted ? (
 				<div className="stack horizontal items-end">
 					<LinkButton
 						to={tournamentEditPage(tournament.ctx.eventId)}
diff --git a/app/features/tournament-bracket/core/Tournament.ts b/app/features/tournament-bracket/core/Tournament.ts
index 6efdf92b8..bc7330a69 100644
--- a/app/features/tournament-bracket/core/Tournament.ts
+++ b/app/features/tournament-bracket/core/Tournament.ts
@@ -1382,6 +1382,31 @@ export class Tournament {
 		return this.ctx.author.id === user.id;
 	}
 
+	/**
+	 * Checks if the given user can edit the tournament's calendar event info.
+	 *
+	 * Mirrors the authorization enforced when the edit is submitted: organization
+	 * admins can only edit when the organization is established, unless they have
+	 * the TOURNAMENT_ADDER role.
+	 */
+	canEditEventInfo(
+		user: OptionalIdObject,
+		{ isTournamentAdder }: { isTournamentAdder: boolean },
+	) {
+		if (!user) return false;
+		if (isAdmin(user)) return true;
+		if (this.ctx.author.id === user.id) return true;
+
+		const isOrganizationAdmin = this.ctx.organization?.members.some(
+			(member) => member.userId === user.id && member.role === "ADMIN",
+		);
+
+		return Boolean(
+			isOrganizationAdmin &&
+				(isTournamentAdder || this.ctx.organization?.isEstablished),
+		);
+	}
+
 	/** Checks if the given user is an organizer of the tournament. */
 	isOrganizer(user: OptionalIdObject) {
 		if (!user) return false;
diff --git a/app/features/tournament-bracket/core/tests/mocks-li.ts b/app/features/tournament-bracket/core/tests/mocks-li.ts
index 5c2f5dc27..9d25cc332 100644
--- a/app/features/tournament-bracket/core/tests/mocks-li.ts
+++ b/app/features/tournament-bracket/core/tests/mocks-li.ts
@@ -6923,6 +6923,7 @@ export const LOW_INK_DECEMBER_2024 = (): TournamentData => ({
 			id: 3,
 			name: "Inkling Performance Labs",
 			slug: "inkling-performance-labs",
+			isEstablished: 1,
 			logoUrl: "fZrToLQrkqV3UZkdgwp0Q-1722263644749.webp",
 			series: [],
 			members: [
diff --git a/app/features/tournament-bracket/core/tests/mocks-sos.ts b/app/features/tournament-bracket/core/tests/mocks-sos.ts
index d638f3c0f..794d8b3f8 100644
--- a/app/features/tournament-bracket/core/tests/mocks-sos.ts
+++ b/app/features/tournament-bracket/core/tests/mocks-sos.ts
@@ -2026,6 +2026,7 @@ export const SWIM_OR_SINK_167 = (
 			id: 3,
 			name: "Inkling Performance Labs",
 			slug: "inkling-performance-labs",
+			isEstablished: 1,
 			logoUrl: "fZrToLQrkqV3UZkdgwp0Q-1722263644749.webp",
 			series: [],
 			members: [
diff --git a/app/features/tournament/TournamentRepository.server.ts b/app/features/tournament/TournamentRepository.server.ts
index e05e664e1..de27605bf 100644
--- a/app/features/tournament/TournamentRepository.server.ts
+++ b/app/features/tournament/TournamentRepository.server.ts
@@ -85,6 +85,7 @@ export async function findById(id: number) {
 						"TournamentOrganization.id",
 						"TournamentOrganization.name",
 						"TournamentOrganization.slug",
+						"TournamentOrganization.isEstablished",
 						concatUserSubmittedImagePrefix(
 							innerEb.ref("UserSubmittedImage.url"),
 						).as("logoUrl"),
diff --git a/app/features/tournament/tournament-utils.test.ts b/app/features/tournament/tournament-utils.test.ts
index bd3a83c88..0a9f2da7d 100644
--- a/app/features/tournament/tournament-utils.test.ts
+++ b/app/features/tournament/tournament-utils.test.ts
@@ -782,6 +782,7 @@ describe("tournamentNameParts", () => {
 					id: 1,
 					name: "Sendou's Tournaments",
 					slug: "sendou",
+					isEstablished: 1,
 					logoUrl: null,
 					members: [],
 					series: [{ name: "In The Zone" }],