Absolutely nothing! Funds are transferred on a rolling monthly basis to charities, for any donations made to any of its pages (including your Fundraising Page!). Fundraisers don't need to worry about having to click any button, or wait for their event date to come around - funds are automatically transferred via bank transfer to your Charity of choice, regardless of what stage you have reached in your fundraising. This means, you don't have to have reached your target for your Charity to be paid either.
Charities receive all funds via bank transfer each month, no later than the 14th of each month. This means any funds raised in May for instance, would be transferred no later than the 14th of June.