Merge pull request #295 from great-h/293-nishimotz

Update 2013-10-02-event-020.markdown
酸化
Merge pull request #296 from great-h/294-takanashi66

酸化
異臭にリンクはった
Update 2013-10-02-event-020.markdown
#300 参加表明
Merge pull request #301 from great-h/moriC

#300 参加表明
Merge pull request #299 from great-h/297-isabisi1484

異臭にリンクはった
#20参加
Merge pull request #304 from great-h/303-fujioenoki

#20参加
updated activity of nishimotz regarding issue #293