Tea party: could it be on Saturday instead? I can't do Sunday. Should also be encouraging people to buy from the coffee shops (all 4 of them!). Is there a temporary barracade down the middle of the road though? There is near the juntion but I don't know how far up it goes.
P4: don't know the situation now but on Saturday the bus stops on both sides of Honor Oak Road (London Road end) had 'bus stop not in use signs on', as did the bus stop across the road from the Horniman. I ended up walking all the way to Dulwich.