The dinner fundraiser is set to be the first of as many as 50 finance events that the campaign and party are racing to set up as they try to rapidly build out a structure to appeal to major donors. Trump’s willingness to participate in the functions — after months of bashing other candidates for their ties to wealthy contributors — represents a dramatic shift in his posture.

The Trump campaign, which has no apparatus to solicit contributions, is now finalizing plans with the RNC to participate in a joint fundraising committee that can accept large contributions. The so-called victory fund is expected to be led by a group of senior party financiers, including Ray Washburne, a former RNC finance chairman, according to several people familiar with the plans. Washburne left his RNC post last year to serve as finance chairman for New Jersey Gov. Chris Christie’s presidential campaign. In a brief phone conversation, Washburne declined to comment.

It remains unclear who else will be part of the effort, but GOP officials are working to bring together a group of heavyweight party fundraisers with strong ties to major Republican donors in hopes of winning over reluctant contributors.