Matt is also the name of a gay guy I know...I think the old chestnut of 'so and so is having a party' might do...
(,
Sun 3 May 2009, 4:56,
archived)
You could tell her you're going to a Digital Arts meeting and that you've been invited by VIMOD
BargeArse Maker of fine Trouser Trumpets since 1863,
Sun 3 May 2009, 4:59,
archived)