On Saturday, 30 October, bypolls will be held in 29 Assembly seats and three Lok Sabha constituencies spread across 11 states and Union territories.
Bypolls on their own don't often reflect any major national trend. The Quint had earlier put out data showing that ruling parties at the state level tend to have an advantage at least in certain states.
However the bypolls will send a national message as they are taking place at a politically crucial time:
The Narendra Modi government is roughly halfway through its second term. The BJP is facing flak due to price rise, unemployment, the farmers' protest, and violence against Muslims in Tripura.
On the other hand, increasing focus on Pakistan, attacks on Hindus in Bangladesh, and migrant workers in Kashmir are contributing to an atmosphere of polarisation that may work to the BJP's advantage.

