Highland Games are great fun but whether they have any historic validity is a seriously different matter. The BBC have recently had some excellent articles on such Games -
http://www.bbc.co.uk/news/in-pictures-27891460 'Americans always, Scottish forever' being a look at the the California Highland Games - reminding me of my visit to the Dubai Highland Games in the early 1990s...
http://www.bbc.co.uk/news/uk-scotland-28066270 being a general comment about such Games.
http://www.bbc.co.uk/news/uk-scotland-north-east-orkney-shetland-27732501 for a brief comment about Braemar Highland Games.
http://www.ambaile.org.uk/en/sub_section.jsp?SectionID=3¤tId=94 provides a useful comment about the Victorian 're-invention' of Highland Games (along with Clan tartans, Clan badges, romantic Clan histories and such like...)