Getting people to participate in intramurals might be a little difficult, but with philanthropies, everyone should probably be involved. Are your members required to show up to all events voted on by the chapter? If not, something is definitely wrong.
For example, my chapter has determined that if a member does not show up to an event which has been voted on by the chapter, without a legitimate excuse (to be approved by the advisor no less than 24 hours in advance), it counts as an unexcused absense, and the member is placed on "poor standing". This can also happen if a member shows up more than 10 minutes late to an event on two different occasions. When in poor standing, that member can't vote, hold a position or attend social functions for 3 weeks. If this happens twice within a fairly short period of time, they must meet with Tau Honor Council (standards board), and if it happens a third time, their membership can be voted on by the chapter.
Sometimes it sucks to have to call people out when they're not doing their part, but it's all about what's best for the chapter. And if half of your chapter is made of up people who don't want to do ANYTHING, then it's time to clean house.
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I believe in the values of friendship and fidelity to purpose
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