This is by no means a comprehensive list of everything that will happen in the next three weeks. However, in terms of mod-directed plot at the moment, this is fairly complete.
Plot Timeline
May
(21 May) - Death Eaters ambush Aurors, take Mulciber, & force a trial cancellation DE: Evan, Nona, Rabastan, Thomas Ministry: Alastor, Frank, Xavier Wizengamot: Amelia, Rodolphus
(22 May) - Riots following Mulciber's escape; Ministry crackdown on rioters Present at riots: Charity, Decima; Ministry: Annie, Brandon, Gideon, Moody; Open to anyone
(24 May) - Auror Oliver Wilkes attacked by Brandon Chambers (BOMB)
(Late May) - Announcement of BOMB Task Force members (No Muggleborns or trainees) Ministry: Xavier & his new minions appointees
(Late May) - Trailing Lily leads to a confrontation Death Eaters: Alecto & Daniel Order: Doc & Lily
(29 May) - Final Hogwarts Quidditch match (Gryffindor vs. Ravenclaw)
(30 May) - Task force throws BOMB members in jail BOMB: Charity, Dedalus, Glinda Ministry: Task force members
June
(2 June) - Attack on random pureblood family (Any offers? Davis, Macmillan, Parkinson, Selwyn) BOMB: Barnabus, Brandon, Phoebus, Open to non-arrests
(5 June) - Death Eaters attack Hogsmeade (just happens to be final weekend for the students) Death Eaters: Ally, Barty, Bella, Fenrir, Nona, Thomas, Tony, Xavier (Open to all) Order: Abe, Doc*, Fab, Gid, Lily, Marlene, Mary, Moody, Sturge (Open to all) Hogwarts & misc: Edgar, Kasia, Nat, Sera, Severus
(6 June) - Ministry recovery efforts - Hogsmeade Ministry: Annie, Brandon, Emmeline, Oliver, Open to all(esp., DMLE)
There are only two birthdays to note in this period: Matilda (21 May) & Emmeline (23 May). Three if you count Jack who's dead now but his was on the 23rd of May as well.