...we want a name that will last and we can take pride in if this comes off. I humbly off these few suggestions to spark some thoughts ...
Winnipalooza (to go with what's been mentioned), WinniWhoopla, WinniWingding
Winni Forum Frolic, Winni Forum Fiesta
Winnipamboree, Winnipesboree, Winnipescapade
[new idea but a bit 'sweet'] Winni Forum Frendezvous
personally I'd think some take-off on an Indian name for meeting (Winnipespowwow, aarrrggg) or such would be appropriate but I can't put it together.