ATTEMPTS to find a sponsor for a second professional tournament in Hongkong will be stepped up over the next month. The last week in October has been provisionally set aside for a 72-hole Australasian Tour event at the Discovery Bay club. And plans to stage the tournament were endorsed last week when Don Clegg, president of the Golf Association of Hongkong, met Australasian Tour chief Michael Duff in Singapore. ''We are very keen to hold a tournament in Hongkong and there is clearly interest among potential sponsors,'' said Duff. Clegg believes that Hongkong is capable of finding sufficient support to host the event which would have no conflict with the Hongkong Open which would remain part of the Asian Tour. Sponsorship is the main factor in the discussions surrounding the logistics of bringing an Australasian Tour event to the territory. Even though a large proportion of the field would comprise Australian players, it is unlikely the likes of Greg Norman, Ian Baker-Finch, Steve Elkington and Craig Parry would compete as they spend most time in America and Europe. However, many well known players from Australia and New Zealand would take part along with a sprinkling of Asian players, particularly from Hongkong, Singapore, Malaysia, the Philippines, South Korea, Taiwan and Thailand. Although several large Hongkong companies have expressed an interest in sponsoring golf events, whether a field lacking at least a couple of top names would attract millions of dollars' backing remains open to question. For several years the Australian Tour has considered broadening its base to Southeast Asia and a link-up between Australian and Asian circuits has been repeatedly mooted. The first steps in that direction have now been taken with two Malaysian tournaments and one in Singapore being included as part of the 1992-93 Australasian Tour. Unhappy at the expansion of the European Tour into Asia, Duff has made it clear he is anxious to strengthen his Tour's ties in this part of the world.