Add Gurobi community event info (#182)

Author: odow

_posts/2024-09-26-jump_dev_2025.md

@@ -45,7 +45,8 @@ excursion. The schedule is subject to change at any time.
  * Monday 17 November: talks at [GridAKL](#venue), dinner at [Good George](#dinner)
  * Tuesday 18 November: talks at [GridAKL](#venue)
  * Wednesday 19 November: [self-guided excursion](#excursion)
- * Thursday 20 November: hackathon at the [University of Auckland](#venue)
+ * Thursday 20 November: hackathon at the [University of Auckland](#venue),
+   followed by the [Gurobi community event](#gurobi)
 
 ### Talk schedule
 
@@ -80,6 +81,13 @@ Symonds street.
 ORSNZ 57 will be simultaneously taking place in the nearby
 [University of Auckland Conference Centre](https://maps.app.goo.gl/MQ2TXDx3GYK1funV6).
 
+### Gurobi
+
+The Gurobi Optimization Community roadshow will take place after the hackathon
+on November 20.
+
+You must [register in advance at gurobi.com](https://www.gurobi.com/events/the-optimisation-community-auckland/).
+
 ### Accommodation
 
 There are a wide range of accommodation options within walking distance.