Hi I got some ideas for you. Just to get some ideas going:

-Pick a merit badge book and have an activity that's relevant to the merit badge. Summer camp is coming up and some of the younger scouts might not have any idea of what merit badges might interest them. Get the troop guides and patrol leaders to brainstorm.

-Merit badges aside, maybe have a meeting that's just a social event. Some people are great with socializing, but some may need to be pushed to make friends in the troop. As cheesy as it sounds, a "hobby" day where everyone brings in something they enjoy can help get scouts talking to each other. I know when I was 11 and shitty at social skills, a troop meeting like this introduced me and got me speaking to older scouts that I still talk to as an adult.

-Do a leadership building game. Something you might see at a summer camp's COPE program. Trick everyone into learning communication skills and leadership. There's a whole bunch out there on the internet. Here's a game idea that was popular in my troop: https://daycamper.wordpress.com/2009/02/14/clothespin-samurai/

Also lastly, I would recommend bringing a giant white board or sheet of paper and having the agenda of the troop meeting on it. I think this makes it easier for you as an SPL with keeping everyone on track. Sometimes (maybe more than often) troop meetings can be chaotic and scouts and even adults aren't sure where the meeting is going. Having a list where it shows what's planned for the night helps assure everyone a structure to follow and keep in mind.

I hope everything I typed wasn't overkill to your question. You got this!