Facing a Monday deadline with no sign of major donors in sight, the Eugene City Council Wednesday tweaked its offer to purchase Civic Stadium. Last November, the city proposed buying Civic for $4.5-million on the condition that donors stepped up with $5.5-million. At Wednesday’s work session, the council voted to remove the contingency requirement. Councilor Mike Clark expressed doubt about the school district choosing the city’s proposal. And he doesn’t think the city should over extend itself financially.