In the event that rain doesn’t ruin today’s festivities, here’s a few links that may make your day planning easier.

Events happening around town:

http://www.philly.com/philly/news/20070704_July_4th_festivities_across_the_area.html

Fireworks displays by region:

http://www.philly.com/philly/travel/visitors_guide/events/fireworks.html

Possibly the most useful item is this PDF - which details the legal requirements if you want to fire off your own fireworks.  Among the legal items in Pennsylvania:

• Sparklers
• Smoke bombs
• Fountains
• Wheelers/Spinners

Full list here.