Add 2nd sparse summit agenda (#384)

Author: jarrodmillman

content/summits/sparse/meeting2.md

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+---
+title: "Meeting 2"
+---
+
+## Information
+
+- Date: Thursday, [April 27th 11AM - 12PM Pacific time (click for your timezone)](https://www.timeanddate.com/worldclock/converter.html?iso=20230427T180000&p1=224)
+- Zoom Link: https://ucsc.zoom.us/j/93937164560?pwd=UmZKTmlHeGRMRkN3a2h2SDNJY3lvZz09
+
+## Participants
+
+-
+
+## Agenda
+
+The summit is scheduled for 1 hour and will focus on the proposed array semantics in `scipy.sparse` [(download)][scipy]
+and what work can be accomplished during the [2023 Scientific Python developer summit](https://scientific-python.org/summits/developer/2023/).
+
+1. (5 min) Welcome & Introductions (Jarrod Millman)
+
+2. (50 min) Discussion
+
+3. (5 min) Wrap up and next steps
+
+[scipy]: https://scientific-python.org/doc/sparse-arrays-grant-2022.pdf