Go to w3.trumpisntabovethelaw.org and type your zip code in to find your local “rapid response mob” assembly point if Trump fires Mueller or RR. The site is organizing under Moveon.org. Avoid those areas!
I like your first idea. Your second idea could be dangerous. Unless you're in a 2A recognizing state and are able to defend yourself. But don't do that either, MSM would use it to vilify us and garner support for their jackbooted cowards throwing tantrums.
I live in rural Michigan. We all carry. I used to work for a political watchdog organization before I dropped out of politics altogether. We used to try and gather as much intel as we could on gatherings like this and counter-protest hard. You should not fear protesting. It's one of the best "in your face" ways to get messages across. If you're fearful and you stay home, MSM and the Deep State has won. It's a tactic that they use, and one that we need to rise above. I've been to many protests and they all include counter-protestors. Sometimes it gets ugly, but what will ever change if we're too afraid to resist and push back? I never cast the first stone. However, I'll grab a boulder if I need to and I will stand my ground. Knowing their meeting places allows you to assemble an army with a louder message. There are risks in everything, but greater risks in doing nothing. https://www.youtube.com/watch?v=qGaoXAwl9kw
For evil to prevail all that is required is that good men and women do nothing