What you’re describing sounds like marionette lines/labiomandibular folds, although the depth of these lines can be influenced by several things, including loss of lower-face volume, soft-tissue descent, the shape of the chin and jaw, and the natural anatomy of the area. They are not necessarily caused by volume loss alone. Since you have an important occasion in about six weeks, you actually have enough time for a conservative treatment that gives an immediate improvement, provided the treatment is appropriate for your anatomy. The option I would most commonly consider for relatively quick improvement is hyaluronic-acid (HA) filler. HA fillers can provide immediate volume and have been shown to improve marionette lines and overall lower-face appearance. However, I would not necessarily put a large amount of filler directly into the deepest part of the line. The lower face is a three-dimensional structure, and sometimes restoring a small amount of structural support around the chin, prejowl area, or adjacent lower face produces a more natural result than simply filling the crease. Lower-face filler treatment is generally most effective when the overall facial proportions are considered rather than treating one line in isolation. Your recent 7D HIFU treatment is also worth considering in the timing. HIFU is intended primarily for tissue tightening rather than immediate volume replacement, so I would not expect it to suddenly replace lost volume within the next few weeks. Since you are already six weeks out, I would assess the result before adding additional energy-based treatment. For your upcoming event, I would favor a subtle, staged approach rather than trying to completely erase the folds. HA filler is attractive in this situation because the improvement is generally visible immediately, although some swelling or bruising can occur for several days and occasionally longer. I would also avoid aggressive treatment immediately before the event. Ideally, any filler would be performed with several weeks of recovery time, allowing swelling to settle and providing an opportunity for a small adjustment if needed. If the lines are primarily due to laxity rather than volume deficiency, filler alone may only partially improve them. In that situation, treatments aimed at tightening the skin or, for more significant laxity, surgical lifting may ultimately provide a more substantial correction. So, with six weeks before your occasion, a conservative HA filler treatment is probably the most practical option for an immediate "buffering" effect, assuming an examination confirms that volume loss is contributing. The goal would be to soften the transition and restore some support, not to completely fill every crease or make the lower face look overfilled.