Add upcoming events and some fixes

Author: mrkn

index.md

@@ -1,27 +1,33 @@
-## About RubyData
+# About RubyData
 
 RubyData aims to increase two populations of:
 
 1. Developers who write opensource data tools for Rubyists.
 2. Users who use opensource data tools with their products written in Ruby.
 
-## Development projects, organizations, and communities
+For such developers and users, RubyData provides places to collaborate with each other.
+
+# Upcoming Events
+
+- RubyData Tokyo Workshop 2017.10.26 (to be announced)
+
+# Projects, organizations, and communities
 
 There are some projects, organizations, and communities that aim to make data tools for Ruby.
 
-### Red Data Tools
+## Red Data Tools
 
 Red Data Tools is a project that provides data processing tools for Ruby.
 
 Website: https://red-data-tools.github.io/
 
-### Ruby Numo
+## Ruby Numo
 
 Ruby Numo provides [numo-narray](https://github.com/ruby-numo/narray) and data analysis environment based on numo-narray.
 
 Website: https://github.com/ruby-numo
 
-### SciRuby
+## SciRuby
 
 SciRuby is a community of developers and users of data tools based on [nmatrix](http://sciruby.com/nmatrix/) library.