Manali-trip

I planned so much for Dooars for this February unfortunately all my plans stands cancelld thanx to office.
Now looks like my next leave is going to be straight in April not before that.
This is what i have planned. I will be reaching Delhi on 21st of April and leaving on 28th of April.
So we have picked on Manali-Dharamshala.
Its going to be 3 nights in Manali and 2 nights in Dharamshala.
What i want to know is apart from the usual sights is it possible to add Triund as a side trip??

I asked a silly question of course Triund is possible in april i spoke to enough people and HPTDC.Now here is another big question I am getting confusing answers : Will Rohtang be open??
some say it will be but some say no.So guys help

Most probably the roads to Rohtang will not be open in April. However it will all depend on the weather during that time.

Sorry for being so late,but had an awesome trip in April.Triund was a dream and yes Rohtang was closed.Want to go for an extended trip next year.In fact thought can try Spiti.What will be the best time for that?