MP Iain Stewart is set to be among speakers at the lesbian, gay, bi-sexual, trans-sexual and questioning – LGBTQ – general assembly.
The all-day event will take place at Ridgeway Community Centre in Furzton on January 29.
Representatives from Milton Keynes Council and Thames Valley Police will also give talks and the evening will conclude with a mini film festival.
More than 30 different groups will also give presentations.
Organisers had hoped that gay rights campaigner Peter Tatchell would be able to attend the event, but he had to cancel.
For more information, visit www.qalliance.org.uk/ga2011 or contact Peter at firstname.lastname@example.org