For the durty boys and girls:
1st March - XC at Blairadam. 2 mile lap of singletrack, tech and forest roads -1.5 hours to ride as many laps as possible (a format briefly known as NuBelgian). Some nice stuff in that there forest. More info at blairadam.com presently.
For the roadies:
21st June - the Trossachs Ton. 160km sportive starting in Stirling and taking in a wee climb or two including the Duck's Pass and the Crow Road. More info here.