Hi nachosdelux,

Traditionally Marriott runs two megabonuses a year - one in Fall (Sept-Jan) and one in Spring (Feb-April) which are traditionally the slower months (at least from holiday guest perspective, business guests should still be reasonably reliable) - and so encourages people to stay. May - August are holiday season so, more guests without needing a megabonus to entice them in.

As such - you'd normally not be able to use a megabonus to increase your points. However, in the current economic climate there might be an outside chance that they could run a summer megabonus - I certainly wouldn't bet on it though - I would guess they will just reduce room rates to entice more budget focused travellers (points are only good if you have spare money to spend getting you to the hotel and enjoying yourself whilst you're there imho)