Group photo at wedding

I would definitely do it right after the ceremony. People normally wait until the BP has excited the aisle to disperse, so you could do it then, so don't hide after you walk down the aisle, if that makes sense. If you stick around, people will get the hint.

Or you could post a sign/print in your program your intention so they have a "heads up"

You can kiss at the end of the aisle and the everyone will likely be looking anyway. Once they see the photographer be can say something too.

Do it right after the ceremony, and before you do any other photos. Once the group photo is done(which will take 5-10 minutes tops) then your guests can go enjoy themselves/food/drinks, while you finish other photos.

We did this at my brothers wedding, and they waited until just before dinner, so it was definitely harder to herd everyone in the right direction.

It is awesome seeing the pictures of everyone who attended all together though.

We're planning to do group photos with everyone immediately after the ceremony: celebrant, immediate family, sponsors (Filipino tradition), bridal party, relatives, friends, and all guests.

ETA: We're doing them in groups because we're having a slightly bigger guest list.

Right after the ceremony is your best bet because everyone will be in that one area at once

We did it after the ceremony and right before cocktail hour (before we left to do Bride/Groom photos), We had our officiant announce it.

At one of my beach locations, there is a flight of steps. The photographer goes up and shoots down at the guests -- right after the ceremony.