You are asking about electional astrology, as mentioned in a previous post. It concerns the timing of energy, so that a certain event will carry that energy with it for it's duration. It's like a natal chart for a person (or animal, business, etc) that they take with them throughout their current earthly experience. You can pick whatever energies you want to exist in an event, as well as the areas of life that those energies manifest in, and look to see a good date and time to give birth to that event. First you would learn what the various energies are that the symbols used in astrology represent. Mars is a hard, sharp, brief, hot energy, not conducive to hanging out with friends (unless it's to play sports!). So you preferably want to avoid that energy when picking out a marriage date and time. You can read up on various astrology topics on astrodienst.com, as well as make your own charts on there for no charge. Also you can make charts free on alabe.com., and follow what goes on in your location throughout the day by refreshing the browser. It's a long process to learn about and use astrology, and there is no end to how it can be used. Get the basics first. One book that I started out on 40 years ago was called Horoscope Symbols, by Robert Hand. It can be dry reading, but I think that book will be all you will need until you go off in another direction.
Currently, Moon is heading for a trine to Mercury for another 8 hours or so. This is a busy time, as symbolized by the energies of Mercury. Good for mental work, to include reading and studying.