Your event cards sound pretty similar to the random events chart that I have worked up for Classic, AA Pacific (first edition), and Revised. I use the charts in conjunction with a standard 52 card deck, and have separate charts for the Allies and the Axis. Each player draws one card every turn, and since the same deck is used, every time a player draws a card, that eliminates the chance of the opposite side drawing that card. We have been using the system in my summer historical gaming class for several years and it works quite well. The various suits represent weather effects, technology improvements, production improvements, and one-time bonuses of various types. All of the events are based on actual events from WW2. The one thing that I do not include is the Atomic Bomb. The US was the only power that could have developed the Bomb within the time frame of the war.
I am still working on the set for A&A Europe, first edition. Once I get them all polished up, I hopefully will put them out as a complete expansion set.