Each day of a week is dedicated to a particular god in the Hindu pantheon. Apart from the special Vratas and Upvaas, many Hindus also fast on a particular day in a week. So, if you want to worship all avatras and forms of god in particular, you get one whole day to shower your devotion to the god! Thursday is dedicated to Lord Vishnu and Lord Brihaspati, the guru of gods.
Shloka of the day
गुरुर्ब्रह्मा गुरुर्विष्णुर्गुरुर्देवो महेश्वरः ।
गुरुरेव परं ब्रह्म तस्मै श्रीगुरवे नमः ||
Gurur Brahma Gurur Vishnu, Gurur Devo Maheshwarah.
Guru Shakshat Para Brahma, Tasmai Shri Guruve Namah.
Lord Vishnu and his incarnations are worshiped on Thursday. Devotees also worship their Gurus as well. Yellow is the color of the day. In Bengal, they worship goddess Lakshmi. Through ‘pujas’ and ‘vrats’ on Thursdays, it is believed, devotees are blessed with wealth, success, fame, and happiness.
So, visiting Vishnu or any avatars of Vishnu and any of Guru Temples nearby is believed to help in successful life. The offering made to Vishnu and Brihaspati usually includes yellow colored fruits like Bananas. Yellow flowers are offered to him.