I don't do it very often, but when I do I go with a very old friend and we make a proper day if it, go to the most famous tourist attraction in whatever town we're playing in, have some lunch and lots of beer, see the game and carry on "socialising" into the evening.
He's a dear old friend who I don't see very often these days as we each live more than an hour out of London in opposite directions. This is why travelling for football works - most trips involve going into London and out again, so we meet centrally.
Anyway, it's all very sad, but no-one's helped by us sitting at home feeling sad all day and as we already had the day earmarked we thought we'd still go into London and do "something". WWYD in London this weekend, that's fun, socialble, open and not too inappropriate? I like a drink, but I can't sit in the pub all day!