Thanks Mav, but i would say agerund is a verb that expresses a continuing state of being--
as I can't go fishing today, I didn't go fishing yesterday, and i won't go fishing tomorrow-- our favorite fishing hole has a new sign-- No Fishing
No Fishing means no fishing now, and no fishing tomorrow, no fishing ever-- a continues state of being--
but in i won't go fishing today-- fishing is not gerund--since it is limited to "today"

So, yeah, the idea of lighting a candle of unity to commemerate joining (joined today, joined tomorrow, joined forever)-- a continues state of being! is a gerund.