Surprisingly often, someone offers to host a DDA meeting at their home institution. In general, such offers are to be accepted with enthusiasm (unless the proposed meeting site presents some real or anticipated serious disadvantage). If no one offers to host an upcoming meeting, it may be necessary to beat the bushes a bit until a host is found. One of the jobs of the DDA Vice Chair is to line up a meeting site for two years hence, so that at a given meeting, both the next meeting and the one after that can be announced.
The acceptance of a proposed meeting site is subject to the approval of the DDA Committee.