Fix BOSC links: remove stale alias from 2025, update sponsors and about-bosc for 2027

- sponsors.md: fix /events/bosc/ -> /events/bosc-2026/, past tense, add BOSC 2027
- bosc-2025.md: remove duplicate /events/bosc/ alias
- about-bosc.md: submit link -> /events/bosc-2027/

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: nlharris

content/page/about-bosc.md

@@ -103,7 +103,7 @@ Our focus is on open source work and communities. Code presented at BOSC must be
 
 We try to provide a platform to everyone who wants to present appropriate work. We have "long" talks (typically 17 minutes + 3 minutes for questions), short/"lightning" talks (5 minutes), and posters.
 
-<a href="/events/bosc-2026/submit/" class="btn btn-lg btn-primary">Submit an abstract</a>
+<a href="/events/bosc-2027/" class="btn btn-lg btn-primary">Submit an abstract</a>
 
 
 ### Review abstracts

content/page/bosc-2025.md

@@ -7,8 +7,6 @@ date: "2024-12-17T23:29:18+00:00"
 guid: https://www.open-bio.org/?page_id=8331
 title: BOSC 2025
 url: /events/bosc-2025/
-aliases:
-  - /events/bosc/
 bosc: yes
 
 ---

content/page/sponsors.md

@@ -88,7 +88,9 @@ conference, which attracted a record 2238 participants. For the first time,
 [CollaborationFest](/events/bosc-2025/ismb-collaborationfest-2025/)
 was part of the main ISMB/ECCB conference.
 
-[BOSC 2026](/events/bosc/) will be held in Washington, DC (with an online participation option) July 14-15, 2026 as part of [ISMB 2026](https://www.iscb.org/ismb2026/home).
+[BOSC 2026](/events/bosc-2026/) took place July 14-15, 2026 in Washington, DC, as part of [ISMB 2026](https://www.iscb.org/ismb2026/home).
+
+[BOSC 2027](/events/bosc-2027/) will take place in Copenhagen, Denmark, as part of [ISMB/ECCB 2027](https://www.iscb.org/ismbeccb2027/home), two days between July 18-22, 2027.
 
 <a href="/events/bosc/about" class="btn btn-lg btn-primary">More about BOSC</a>