I'm thinking that as it's good Friday this week it may be an opportunity to have lots of small gestures towards Manfriday, maybe publicise them in a FB group, enlist local radio etc.
And there my creativity has run out 
Personally I am going to do what my DH was going to do - piss off for most of the day to our hobby sports club. And I will use the men's changing rooms
Would it muddy the waters too much to make it a general "assume equality" day? For eg leave the childcare and wife work to the DH/DP?