Brihaspati transits into Simha rasi on July 15th , 2015 and will remain there upto August 11th, 2016. There is lot of confusion being spread that marriages should not be conducted during this period. The shastra position as explained in Muhurta chintamani is this.
1. Marriages should not be conducted only when Brihaspati transits Simha navamsa in Simha Rasi. ie : - September 14th, 2015 to October 1st, 2015.
2. Marriages should be avoided only in areas lying between Ganga and Godavari rivers.
( This is only with respect to transit Guru effects. All other relevant factors should be duly considered)