Hiya,
My DD sometimes has a long sleep after a busy day like that - epsecially when we've done lots of socialising - then goes back to 'normal' (ie waking for feeds 2-3 times overnight). A few mums in my Mother's Group have babies who started 'sleeping through' at about 7 weeks so you may be one of the lucky ones!
As for the wee I'd say it does sound like she could've been a bit dehydrated -my DD's wee is definately 'smellier' on hot days. I guess just try and offer her the boob more often to keep her fluids up. Some people recommend offering sips of water too but not sure if that's suitable for a very young baby....anyone know?