Update upcoming_hackathons.yml

Author: DCGenomics

_data/upcoming_hackathons.yml

@@ -8,6 +8,11 @@
   link: https://pangenome.github.io/MemPanG24/#_biohackathon
   community:
 
+- date: "June 21, 2024 (Demo Day)"
+  loc: "Starting online mid-April 2024, demo day SF June 21"
+  link: https://www.rarediseaseaihackathon.org/
+  community:
+
 - date: "August 28-31, 2024"
   loc: "Baylor Structural Variant Hackathon"
   link: https://www.hgsc.bcm.edu/events/hackathon