Add ORSNZ as sponsor for JuMP-dev 25 (#173)

Author: odow

_posts/2024-09-26-jump_dev_2025.md

@@ -14,6 +14,10 @@ This is the week following [CPAIOR 2025](https://sites.google.com/view/cpaior202
 which will be held November 10--13, 2025 in Melbourne, Australia. (Melbourne is
 a 4 hour flight and 2 hour time difference from New Zealand.)
 
+JuMP-dev will be co-hosted with the [57th ORSNZ](https://orsnz.org.nz/conf57/),
+the Operations Research Society of New Zealand's annual conference, which will
+take place November 20--21, 2025, also in Auckland, New Zealand.
+
 ## Outline
 
 The purpose of JuMP-dev is to bring together students, researchers, and
@@ -32,7 +36,7 @@ excursion. The schedule is subject to change at any time.
  * Monday 17 November: talks at [GridAKL](#venue)
  * Tuesday 18 November: talks at [GridAKL](#venue)
  * Wednesday 19 November: self-guided excursion
- * Thursday 20 November: hackathon (venue to be confirmed)
+ * Thursday 20 November: hackathon at University of Auckland
 
 ## Key dates
 
@@ -43,8 +47,8 @@ excursion. The schedule is subject to change at any time.
 
 ## How do I attend?
 
-To attend JuMP-dev, you must purchase a ticket. Ticket sales will open in early
-2025\. Accepted speakers at JuMP-dev will receive a free ticket.
+To attend JuMP-dev, you must purchase a ticket. Ticket sales will open soon.
+Accepted speakers at JuMP-dev will receive a free ticket.
 
 To request a visa invitation, please write to `[email protected]`
 with the subject line `Visa invitation letter`.
@@ -98,3 +102,7 @@ walking distance.
  * Miles Lubin (Hudson River Trading)
 
 To contact the program committee, write to `[email protected]`.
+
+## Sponsors
+
+<a href="https://orsnz.org.nz" style="background-image:none;"><img style="height:90px;margin:45px" src="/assets/jump-dev-workshops/2025/ORSNZ.png" alt="ORSNZ logo"></a>