为什么要婉拒啊？这是你增加visibility的机会，再说你去开会了当然回来应该给一个brief。如果是我就forward给你的manager，并且ｃｏｐｙ manager B，I was planning to brief the teams on the key takeaways from the conference, please let me know if you have any suggestion in terms of format and / or content. I'd be more than happy to discuss. That way it sounds like you are taking the initiative instead of simply doing what you are told.
据说这种事情先打听清楚再说。
我以前也以为开会去听听就行了，从来没有人说过我还要写报告。😂
自然是先问问你的老板，他要是不同意，这就是你的理由 他要是同意，你就不得不做， 但是你要优先自己组的的工作。。。
That way it sounds like you are taking the initiative instead of simply doing what you are told.
就要看你自己未来的打算了，打算留在自己组还是想借着机会接近B
A、B老板关系微妙，更要尽早弄清楚，不然两边都只敢让你打杂，哈哈哈。