We've hijacked a review topic here. There's a main brunch topic which has a full list and that's kept more up to date.
There's only one Sunday brunch in the period you've given. The evening dinners are not themed.
This is the list of themes as known so far:
16th Feb - Neverland
23rd Feb - Cinema
2nd March Incan
9th March - New Orleans
16th March - Chefs/Parisien
23rd March - Disney Classics (with the Three Little Pigs rumoured to appear)
30th March - New Generation
6th April - Oriental
7th April (Monday) - African
13th April - London
20th April - Easter
21st April - Easter
27th April - Snow White & Seven Dwarfs
4th May - Asian
11th May - Neverland
18th May - Cinema
25th May - Mother's Day (in France it is)
8th June - New Orleans
15th June - Brazilian (sports outfits for the football World Cup, which is being held in Brazil)