Patels inn has couple of party halls as well a decent swimming pool, a excellent shuttle court. Also they started booking corporate parties and packages with Go Cating included. What else to wait bug your manager ;)
Alternatively you can contact this number for nice discount. 9448080888
Activities to be done when in Bangalore are in plenty. Great Pubs/Clubs on the first place for your night experience. don't miss some popular restaurants like KOSHY's, AIRLINES, COFFEE HOUSE and MTR (if you are foriegner).
Shopping in Brigade Road, MG Road and Commercial Street are Hot amongst the people around. Tourist looking for Silks and stuff like that end up in these places and also end up paying more! ( write to me on firstname.lastname@example.org maybe i can guide you to some sensible places, where you don't spend so much of money)
Places to vist are in plenty, like the Lal Bagh, Cubbon Park, Vishveshwariah Centre for science, Planetorium, Vidhana Soudha, High Court, Palace grounds and a long drive around bangalore on the Outer Ring Road.
Some amazing Temples are found in and around bangalore, which really are worth visiting.
other activities would be Bowling and Go Karting which the hottest things happening.