Adhik Bhadrapad Month 2012 in North Indian Hindi calendar begins on August 3 and ends on August 31, 2012. Adhik Maas is an extra month which comes in Lunar Hindu Calendar (both: Amavasyant & Purnimant Panchangams) for every 28 to 36 months.
In 2012, Sri Krishna Janmashtami also comes in Adhik Bhadrapada maas as per North Indian calendar.
Other than Sri Krishna Janmashtami, there is no major festival in Adhik Bhadrapada Maas.
Here are some Hindu festivals & Auspicious days in Adhik Bhadrapad Month 2012 in Hindi calendars followed in Madhya Pradesh, Uttar Pradesh, Chhattisgarh, Jharkhand, Orissa, Himachal Pradesh, Rajasthan, Bihar, Punjab, Haryana, etc..
3 August 2012: Panchak begins. Meghmala Vrat arambh. Ashunya Shayan Vrat ends. Kajliya in Madhya Pradesh.
4 August 2012: Shani Tulela. Bhimchandi Vindhya Jayanti. Fulkajli Vrat.
5 August 2012: Sankashti Ganesha Chaturthi. Kajjli Teej (Kajjali Tritiya Vrat). Boodi Teej. Satva Teeja. Sathudi Teej. Vishalakshi Yatra.
6 August 2012: Raksha Panchami. Goga Panchami. Bhai Bhinna
7 August 2012: Panchak ends. Chandrasashti Vrat in Rajasthan. Madhavdev Tithi Assam.
8 August 2012: Lalahi Chhath Vrat. Hal Sashti. Hal Chhath. Shitala Vrat.
9 August 2012: Sri Krishna Janmashtami Upvaas. Janmashtami for Smarta sect of people. Kalashtami. Durvashtami Vrat. Adhyakaali Jayanti. Bhanu Saptami.
10 August 2012: Gopalkala. Sri Krishna Janmashtami vrat for Vaishnav sect. Sri Krishna Jayanti. Sri Jayanti Ramanuja Sampradaya.
11 August 2012: Goga Navami (Gugga Navami). Nandotsav Nandgav. Rohini Vrat.
13 August 2012: Ajaa Ekadasi (Jayaa Ekadasi).
14 August 2012: Govatsa Puja. Bah Baras.
15 August 2012: Bharat Svatantra Divas (Indian Independence Day). Pradosh Vrat. Maas Shivratri. Dhwajarohanam.. Kailash Yatra (2 days). Yogi Arvind Jayanti.
16 August 2012: Guru Pushyamrit Yog. Magha Simharka Sankranti. Aghora Chaturdasi.
17 August 2012: Darsh Pitori Amavasya. Pola, Vrishabha Pujan. Darbhaharan. Nakta Vrat ends. Kushotpatini/ Kushagrahani/ Matruka/ Snandaan Amavasya. Sati Puja. Sri Shakti Pujan.
19 August 2012: Chandra Darshan.
21 August 2012: Vinayaka Chaturthi (Angarak Yoga)
24 August 2012: Monthly Durgashtami
27 August 2012: Kamala Ekadasi (Kamala Purushottam Ekadasi). Agastyoday.
29 August 2012: Onam festival in Kerala. Pradosh Vrat
30 August 2012: Panchak begins. Purva phalgunyark Yoga.
31 August 2012: Adhik Bhadrapad Paurnima.