Congratulations, First Light!
Astrology can be used to assess the potential of a relationship through
1. Synastry: The astrologer looks at both horoscopes and how the planets in one connect with the planets in the other.
2. Composites: The astrologer combines both horoscopes into one, and this composite chart represents the horoscope of the relationship. You can use it as a timing tool, just as you use your own birth chart. If a relationships is going through a challenging period, for example, transits to the composite chart will reflect it.
3. Elections: Astrology can be used to elect a time to do something significant -- e.g., get married, sign a contract, launch a website, etc. Caveat: you can't elect a time to do something that the birth chart denies. Example: I can't elect a time to win the lottery if there is no suggestion in my horoscope that winning the lottery is a real possibility 
Is it possible to assess the wedding date you've chosen and how it blends with the horoscopes of you and your intended? Yes, the wedding date gives us current transits in your horoscope. Transits = where the planets are now with respect to where they were when you were born. As transiting planets make contact with planets in your birth chart, they generate TENSION...which leads to probable ACTION.
Hope that helps. I am a professional astrologer, BTW.
Warm regards,
Elisabeth
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