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I think for the anniversay, councils (depending on size) could try to do things that emphasize the 100's theme.
Councils could celebrate by having 100 rededications in the center of 100 town during Scouting anniverary week (being done by local packs/troops).
They could have 100 service projects done in a week-long time-frame.
100 campouts could be done in local parks on the same weekend...like a camporee in 100 locations.
100,000 hours of service could be done throughout the year.
Any other ideas?