Arranging temporary childcare during a conference in an unfamiliar city [migrated]

Next year, I will be attending a conference in an unfamiliar city. The conference that offers a partial reimbursement for child care services rendered at the conference city during the conference days. This is entirely new to me, and I'm not sure how people typically make arrangements in unfamiliar cities for temporary child care during a conference.

What is the best way to make arrangements for temporary child-care while attending a conference in an unfamiliar city?