I will be going to a kid's birthday party sometime in March basically because the mom and dad are friends with my wife. I'm not very keen on it because I'm generally not my best in large social circles, never mind a social circle with kids, moms and dads (we don't have kids). I will be going because even though my wife says I don't need to go, she will really appreciate it if I made the effort to go. To offset my disinterest in this party, I'm planning on taking my camera (E-M1) and take candid pictures of the kids and adults. Here are the lenses I have: 12-40 pro 40-150 pro (and 1.4x) 60mm f2.8 macro 75mm f1.8 If it's anything like the party in 2014, it is going to be in a large park under most likely strong/ flat sunlight (safe guess seeing I'm in AZ). There will be a bounce house or similar for kids to play around. Eventually there will be a pinata for kids hung under a shaded tree to break open to get to the candy inside with everyone gathered around in a relatively tight circle. As I mentioned earlier, I will only be taking candid pictures. I'm not comfortable getting people to pose. And this will purely be for (my) entertainment, not a paid gig. Which lens would you recommend from the ones I have? Or would you recommend another lens that I don't have? Any thoughts would be appreciated.