Your cause is an ongoing one, which is why awareness and contributions should continue well after the event. Continue to use the event hashtag for a few more days and also encourage people to continue to donate, all while keeping your followers updated on the total contribution amount and how the funds will be dispersed. In the weeks after, share pics or posts related to post-event activity. Perhaps this can be a pic of you presenting a giant check to that children’s hospital you were raising funds for, or construction work to build that park in the inner city neighborhood that your event helped pay for.