A sausage party is a party in which the men outnumber the women. Sausage, in this respect, refers to the penis; which makes this sort of party both good and bad. For a gay man out to have a good time, a sausage party with other gay men is a good thing. However, for a straight man, a sausage party is a venue with very little romantic options.
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If a person wants a “balanced” party, where the number of men equals the number of women, then it's a good idea to invite several female friends, and to ask them to invite their female friends. Outreach is key to the turnout of women to attend a party. Of course, one needs to make sure that women who attend the party are inclined to stay, too. Don't just have a party with food and drinks favored by men. Include female favorites as well.