Since about 2016, they've had the same very basic suggested presentation for offering convention invitations every year.
It's just something like "we're here to invite you to a special event that's going to be held at <venue> on <dates & times>. This is your invitation. We'd be happy to see you there."
There's also the option to highlight a couple of points from the invitation, or to play a short video (of course) to the householder if they show sufficient "interest".
That's about it. No need to show a bible verse or engage in any kind of discussion.
The annual memorial invitation campaign is similar.
Talk about easy ministry.
EDIT: This is the text from the 2016 instructions to publishers, which they recycle every year.
Note the 'What Will You Say' section:
Convention Invitation Campaign
Each year, anticipation builds for the spiritual feast that we enjoy at our regional conventions. So that others too may taste Jehovah’s goodness, we will invite as many as possible to attend with us. (Ps 34:8) Each body of elders will determine how to make the best possible use of the invitations.
DETAILS TO KEEP IN MIND
When is my convention?
When does the campaign begin locally?
When are the local meetings for field service?
What are my goals for the campaign?
Whom do I plan to invite?
WHAT WILL YOU SAY?
After giving a customary greeting, you might say:
“We are involved in a global campaign to distribute this invitation to a very important event. The date, time, and address are printed on the invitation. We would enjoy having you present with us.”
HOW CAN YOU CULTIVATE INTEREST?
Although we want to invite as many people as possible to the convention, we should be alert to cultivate any interest shown.
On weekends, you may offer the magazine along with the invitation.