What is Chaturmas, and why are auspicious rituals halted during this time

Chaturmas, which translates to ‘Chatur - 4, Mas - Month) is a period of 4 months where rituals, good works, and any religious or celebratory ceremonies are halted. It is termed as a period for rest, reflection, penance, good deeds, and the likes, and thus doing anything extravagant and indulging in nature is frowned upon.
It is said that at the start of Chaturmas, Lord Vishnu goes into a deep sleep for 4 months, and without the operator of the Universe awake, no ‘shubh kaam’ is done. The world slows down, the monsoon spreads its wings, and people are expected to look inward, on their actions and the likes.

Chaturmas begins on Devshayani Ekadashi, an Ekadashi that falls in June or July, and Lord Vishnu goes into a deep sleep. He is said to be in ‘Yoga nidra’ during this time, in the ‘Ksheer sagar’, and then he wakes up on the day of Devuthni Ekadashi.
After that, people resume auspicious functions like weddings, birthing ceremonies, housewarmings, etc.

Devshayani Ekadashi is thought to be a turning point for the Universe because Lord Vishnu starts his ‘shayan’ which basically means rest. On the day of Devshayani ekadashi, devotees observe fasts, chant the name of Lord Vishnu, offer him prayers and bhog, and pray for a safe and healthy Chaturmas.
In many temples, symbolic rituals are performed where an idol of Lord Vishnu is shown reclining on a snake bed.

The reason why grand or extravagant rituals and ceremonies are halted during Chaturmas is that spiritually, this period is a time when divine energies are at rest. And so performing any major celebrations during this time is seen as going against the natural spiritual flow of the universe.
Plus many also believe that if Lord Vishnu is in ‘nidra’, who will bless people and their acts?

Although social activities are paused during this time, it does not mean that humans go into complete rest too! This time is actually considered very spiritual, and people try to accumulate good karma during the time. They observe days like Guru Purnima, keep fasts and do havan during the Pitra paksha, there is also the month of Sawan, and much more.

Another important part of Chaturmas is its connection to ancestors. The last month of Chaturmas includes a fortnight known as Pitra Paksha or Shraddh Paksha, when people perform rituals to honour their ancestors. They offer food, water, prayers, charity, and more, and it is believed that this brings peace to the souls who have passed on.