Is the invitation sent by the woman to her colleague a wedding banquet or a wedding banquet?
This is a wedding reception. The wedding reception is held at the bride's home before the bride is taken away, usually the day before the wedding. It's very small, only her family will attend. The wedding reception will be more formal and grand. Generally speaking, colleagues from both sides and all family and friends will be invited, so the invitation sent by the woman to her colleagues is the wedding reception.