Honolulu Mayor Kirk Caldwell continues to aggressively fill his war chest.

A campaign fundraiser was held Wednesday night at Waikiki Business Plaza, where the donation suggestion was $1,000.

It is Caldwell’s 29th fundraiser since April 2013.

It follows a fundraiser held last month at a Washington, D.C., hotel (the Fairmont in Georgetown, says Google Maps) that asked for contributions ranging from $500 to $4,000.

Ernie Martin, the Honolulu City Council chairman who is rumored to be weighing a Caldwell challenge, has held only three fundraisers this year.

Martin’s council seat is not up until 2018.

Hawaii’s primary election in Aug. 13.

UPDATE: Aulani Kaaihue, a research assistant at UH Manoa, says she is running for mayor. Here’s the website.