Update README.md (#320)

README.md

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 ## Hackathon Events
 
 ### Upcoming Events
-- [Open Neurodata Showcase: Virtual, July, 2024](HCK20_2024_OpenNeurodataShowcase/README.md): **July 2, 2024** (virtual)
 - [NeuroDataReHack: July 2024](HCK21_2024_Janelia_NDRH/README.md) - NeuroDataReHack 3 will be held at HHMI Janelia Research Campus in Ashburn, Virginia, USA **July 8-12, 2024**.
 - [NWB and DANDI Workshop INCF: September 2024](Workshop_2024_INCF/README.md) -  **September 26-27, 2024** in Austin, Texas, USA.
 
 ### Past Events
+- [Open Neurodata Showcase: Virtual, July, 2024](HCK20_2024_OpenNeurodataShowcase/README.md): **July 2, 2024** (virtual)
 - [NWB and DANDI Workshop: June 2024](Workshop_2024_JHU/README.md) - **June 20 - 21, 2024** at Kavli Neuroscience Discovery Institute at Johns Hopkins University, Baltimore, MD, USA
 - [NWB Data Conversion Workshop: June 2024](HCK19_2024_Remote/README.md) - **June 12 - 14, 2024** (virtual)
 - [NWB Developer Hackathon: April 2024](HCK18_2024_Dev_Hackathon_DataJoint/README.md): **April 17 - 19, 2024** at DataJoint Headquarters in Houston, TX, USA