Hi Jyoti, yes you can visit Dharamshal in July/August. I have attached with this comment a perfect page for you, you can click on them to find more details about them. If you want to talk to someone about the packages simply fill in your details in the form and you will receive a call.
Dharmasthala is generally flocked by tourists all round the year; however, the best time to visit is during the months of November to January. The temperature range is moderate and in comparison to northern India, the weather is very pleasing. Avoid Summer (May to June) and Monsoon (July to September), as the region is scorching and humid making it unbearable for sightseeing or other outdoor activities.