What is a Sheva Brachot?

During the week following a wedding, festive get-togethers are held in honor of the couple. Each of these events—usually an elegant dinner—is called a Sheva Brachot ("Seven Blessings"), referring to the seven blessings that will be recited each time following the Grace After Meals. They are the same blessings that were recited at the wedding itself under the chuppah, expressing requests for G‑d's blessing for the newlywed couple. 

Though not mandatory, it has become common to have a Sheva Brachot every day of that first week. Traditionally, family and close friends divvy up the honors of hosting them. 

https://www.chabad.org/library/article_cdo/aid/2984558/jewish/What-to-Expect-at-a-Sheva-Brachot.htm

Also….

https://www.chabad.org/library/article_cdo/aid/313725/jewish/The-Seven-Benedictions-Sheva-Berakhot.htm