Q: How to deal with being asked to attend a meeting outside work hours?
A: There are two aspects to this: the impact on the meeting’s subject and the impact on your personal situation. The former will take in e.g. if its really any trouble for you; if it can be moved; if you can join remotely; if you are there simply as a ‘cover all bases’ or actually have key input. The second will be a judgement on e.g. the boss has invited you and it would reflect badly if you refused; the session is time critical so your non attendance would be project impacting; you are essential at the session and again non attendance would be poorly received. In short you need to decide if you can manage this without too much effort or with some adjustments if its worth it to your image to turn it down. Only you know the style of your organisation/team to evaluate that.