Which Indian state or Union Territory hosted the three day "International Yoga Fest" held from 8th to 10th March 2017?

Introduction / Context:
International Yoga related events have become prominent in India, especially after the United Nations declared an International Day of Yoga. Various festivals, conventions and fests are organised in different parts of the country. One such event was the International Yoga Fest held in early March 2017. General awareness questions frequently ask where these major yoga events were hosted.

Given Data / Assumptions:
- The event is named International Yoga Fest.
- The dates are 8th to 10th March 2017.
- The options list several Indian states and one Union Territory: Uttar Pradesh, Madhya Pradesh, Maharashtra, Delhi and Uttarakhand.

Concept / Approach:
Large national and international level yoga events are often organised in the national capital because of ease of access, facilities and visibility. The International Yoga Fest mentioned was held in Delhi, which is a Union Territory with the status of the National Capital Territory. Recognising that many such flagship events are hosted in the capital helps point to Delhi as the correct answer.

Step-by-Step Solution:
Step 1: Recall reading about the International Yoga Fest held in March 2017 as a run up event to the International Day of Yoga. Step 2: Remember that it took place in the national capital, with participation from various yoga organisations and international delegates. Step 3: Look at the options. Only Delhi is the National Capital Territory known for hosting such events at major venues. Step 4: Recognise that although Uttarakhand, Uttar Pradesh and others are important in yoga tradition, this particular event was organised in Delhi. Step 5: Select Delhi as the correct answer.

Verification / Alternative check:
Ministry of AYUSH and media reports from 2017 state that the International Yoga Fest from 8 to 10 March was held in Delhi, serving as a curtain raiser for International Day of Yoga celebrations. The event venue and schedule were widely covered in national news, which confirms the location. Exam preparation books that summarise 2017 events repeat the same detail.

Why Other Options Are Wrong:
Uttar Pradesh: Although it has important cities like Varanasi, this particular event in March 2017 was not held there.
Madhya Pradesh: Known for hosting some yoga events, but not the three day International Yoga Fest mentioned in the question.
Maharashtra: Has major cities such as Mumbai and Pune, yet it was not the venue of this specific event.
Uttarakhand: Home to Rishikesh, a famous yoga centre, but the International Yoga Fest 2017 highlighted here took place in the national capital.

Common Pitfalls:
Students sometimes associate yoga events automatically with Uttarakhand or other spiritually renowned states, overlooking the fact that many official international events are held in Delhi. Another pitfall is to rely on guesswork rather than remembering the specific year and dates given. Linking International Yoga Fest March 2017 with Delhi in your notes avoids such confusion.

Final Answer:
The three day International Yoga Fest held from 8th to 10th March 2017 was hosted in Delhi.