BornAgainBrony

How does one celebrate gunpowder day? do they go hunting or what? 

Heh, no. Well originally it was one of those odd propaganda-ish holidays in the U.K. that celebrated the day a plot to destroy Parliament (using a crapton of kegs of gunpowder) was thwarted at the last minute. The old celebrations involved annually tossing effigies of Guy Fawkes (who was the antagonist in the plot) into fire. Other kids dress up as the character and in a pseudo Halloween style tradition, will ask for money with the phrase, "Penny for the Guy?" The money donated was to purchase fuel and pyrotechnics for the festivities. Lots of revelry was naturally involved too, so maybe think like a much more mild version of 'Burning Man.'

Since then, like with a number of national holidays which people later realized were kind of brain-washy, it has evolved greatly into something else. For some it's now a celebration of patriotism, not just for the winner of such plots or struggles, but the loser as well. 'V for Vendetta' cemented this new vision of Gunpowder Day into a sort of celebration of rebellions against tyranny. Guy Fawkes masks are now common at protests and also the symbol of "Anonymous" as a result.

For others now though it's simply an extra fun day to shoot off a ton of fireworks.