NortHACKton is holding a second ballistics day where we intend to launch the
chemical rockets that we couldn't do last time because of excessive winds.
We would love it if you guys could come up with a tennis ball flinging
device and came over to give us a challenge, Nottinghack are also looking at
coming down too so it could be a triple hackspace meet.
Anyway, I've included the original email below with the doodle links so you
could even pick a day that suited you all best for a visit.