The coming week is a big week for festivals in Taipei, all celebrating the birthdays of various gods.
For Baosheng Dadi (a medicine god, rumored to have been a real person), Bao'an temple usually holds several days of festivities. As far as I know now, the firewalking (devotees allow themselves to become 'possessed' by various gods and walk across hot coals) will take place at Bao'an temple (MRT Yuanshan) this Thursday, April 9th. It usually happens around 2-3pm. Anyone interested in a truly Taiwanese experience ought to make it out there.
On the same day at about 2pm, there will be a god procession for Baosheng Dadi near Longshan Temple. It will start just off Bangka Blvd (from MRT Longshan Temple, head down Xiyuan Road and turn left on Bangka Blvd. Walk down past the 350 block and hang a left at the 7-11) at about 2pm.
On Tuesday (the 7th) there will be another big celebration in southern Wanhua. It will start at about 11:30 am at a temple off the southern end of Wanda Road (south of where it merges with Baoxing Road, not far from the river) and go all around Wanhua. We came across an old Matsu temple in our ramblings around that area today and they told us it was a particularly nice god parade. The Matsu temple was repairing its Thousand Mile Eyes da sen ("big doll" - tall god costume) at the time of our visit.