Congress is back in town, and with elections only eight weeks away, Washington lobbyists and political action committee directors are gearing up for a new round of fund-raising events.

The usual array of routine receptions at Democratic and Republican headquarters on Capitol Hill will be spiced up tonight with the "9th Annual Montana Buffalo Roast" for Rep. Pat Williams (D-Mont.) and the first "Florida Tailgate Party" of Rep. Bill Grant (R-Fla.).

Williams's buffalo, furnished each year by a home-state Indian tribe, can be "a little stringy," according to one guest of prior roasts.

The $500-a-person event is Williams's main Washington fund-raiser of the campaign. He won 61 percent of the vote in 1988 and had nearly $173,000 in the bank at the end of June.

His GOP opponent, Bradley Sun Johnson, had more debts than "cash on hand" at that time.

Grant's "tailgate party" seemed a natural, an aide said, because Florida has three major football colleges and the congressman's district includes Tallahassee, home of perennial power Florida State University. Grant had almost $162,000 in his campaign account on June 30. Tickets are $350 each.

George Gould, lobbyist for the National Association of Letter Carriers and one of the city's most active fund-raiser attendees, said he has been invited to seven breakfasts, three lunches, six receptions and a sitdown dinner -- all tomorrow.

"I can't physically make all the breakfasts," he said.