Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Event | Date | Rating | Share | Viewers |
| --- | --- | --- | --- | --- |
| Event | Date | Rating | Share | Viewers |
| Velasquez vs. dos Santos | November 12, 2011 | 3.1 | 5 | 5.7 million |
| Evans vs. Davis | January 28, 2012 | 2.6 | 5 | 4.7 million |
| Diaz vs. Miller | May 5, 2012 | 1.5 | 3 | 2.4 million |
| Shogun vs. Vera | August 4, 2012 | 1.4 | 3 | 2.4 million |
| Henderson vs. Diaz | December 8, 2012 | 2.5 | 5 | 4.4 million |
| Johnson vs. Dodson | January 26, 2013 | 2.4 | 5 | 4.2 million |
| Henderson vs. Melendez | April 20, 2013 | 2.2 | 4 | 3.7 million |
| Johnson vs. Moraga | July 27, 2013 | 1.5 | 3 | 2.4 million |
Question:
What is Event, when Date is April 20, 2013?
Answer:
Henderson vs. Melendez