Add more conference data

src/data/conferences.yml

@@ -644,6 +644,34 @@
   submission_deadline: '2025-01-31 03:59:59'
   timezone_submission: PST
 
+- title: IJCNN
+  year: 2026
+  id: ijcnn26
+  full_name: International Joint Conference on Neural Networks
+  link: https://attend.ieee.org/wcci-2026/
+  deadline: '2025-09-24 23:59:59'
+  timezone: UTC-12
+  date: June 21-June 26, 2026
+  tags:
+  - machine-learning
+  city: Maastricht
+  country: Netherlands
+  rankings: 'CCF: C, CORE: B, THCPL: B'
+  venue: MECC Maastricht
+  deadlines:
+    - type: submission
+      label: Paper Submission
+      date: '2026-01-31 23:59:59'
+      timezone: UTC-12
+    - type: notification
+      label: Paper acceptance notification
+      date: '2026-03-15 23:59:59'
+      timezone: UTC-12
+    - type: camera_ready
+      label: Camera-ready papers
+      date: '2026-05-15 23:59:59'
+      timezone: UTC-12
+
 - title: IJCNN
   year: 2025
   id: ijcnn2025