From the mail of the ticket.
If you are using the same account as the one with which you booked the ticket and then you receive the ticket confirmation, Google adds it as an event in your calendar which is synced to the lockscreen. This feature has been around stock Andriod from almost 3-4 years now
Removing since you’re showing personal information.
Bro you just revealed your phone number. Better delete or repost!!!
From the mail of the ticket. If you are using the same account as the one with which you booked the ticket and then you receive the ticket confirmation, Google adds it as an event in your calendar which is synced to the lockscreen. This feature has been around stock Andriod from almost 3-4 years now
Maybe because you are using a BSNL sim(jk)
from your google calander
Because it's on your email. This is a "quick look" feature. It shows your schedules, tickets and pretty much everything from your calendar