It is always bad to do some late Eid shopping on Eid day.
The reasons can be multiple.
Suppose you want to buy some mathai.
What can possibly go wrong.
The weather - it could be wet.
The queue outside the shop - it is more than likely to be blocking the pavement.
The people serving inside are fast as tortoises.
Some one might takes all their family to choose the mathai.
Some one may want some leisure advice to chooose something and do some sample tasting.
The person serving is oblivious to the people in the queue.
Some one may want his friends to do some queue jumping.
This may aggravate some other people.
What ever the case, it not going to take less than 30 minutes to get served.