There is a $40/day registration fee, $5/day for non-DIMACS postdocs, to be collected on site, cash or check only. The fee is waived for graduate students and DIMACS long-term visitors and postdocs in residence at DIMACS. Fees for all members are covered through their institution's membership in DIMACS and therefore no member needs to pay the registration fee.
Attendees who have been offered support should keep two rules in mind. Reimbursement for air travel can only be made for travel on US Flag Carriers, REGARDLESS OF COST. (For example, travel on airlines such as United, Continental, USAir, and others that are United States based are allowable. Travel on airlines such as Lufthansa, SAS, Air Canada and other airlines based outside the US cannot be reimbursed by DIMACS.)
The second rule to keep in mind is to get original receipts for all reimbursable expenses.