Answer
In the Name of Allah, Most Gracious, Most Merciful.
All praise and thanks are due to Allah, and peace and blessings be upon His Messenger.
In this fatwa:
Having mixed gatherings in the community center is permissible so long as it does not lead to anything prohibited by Islamic law.
Answering your question, Dar Al-Ifta Al-Misriyyah, states:
According to the practice of generations of Muslims from among the predecessors and successors, the mere presence of males and females in the same place is not prohibited in itself.
Rather, the prohibition concerns the manner of their gathering if it contradicts the rulings of Islamic law. This includes, for example, women uncovering what they have been commanded to cover in Islamic law, gathering to commit an abominable act or sitting in unlawful privacy with the opposite sex.
As for the prohibited mixing between the opposite sexes, it is that which involves touching and physical contact and not merely being present in the same place.
It is permissible to attend such gatherings and none will be blameworthy except whoever exceeds the limits of Islamic law. However, it is impermissible to attend if one fears temptation.
Almighty Allah knows best.
Source: http://www.dar-alifta.org/Foreign/ViewFatwa.aspx?ID=6023