“The MUG Event Calendar” for May opens with appearances from the two biggest Mac developers around.

Apple Senior Systems Engineer Dave Marra will present to a New York group, while Eric Paquin of Microsoft will show off Office ‘11 to a group in Ireland. Other topics on this week’s agenda include DevonThink, Skype, toktumi, Firefox 4, iOS 3, Thunderbolt, file sharing, cloud computing and more.

“The MUG Event Calendar” can be found at The MUG Center (http://www.mugcenter.com), an online resource for Mac User Groups. MUGs are good places for making new friends in the Mac community, improving your computing skills, finding solutions to technical problems, and perhaps locating a good deal on used hardware. For more info on MUGs, and to find the location of the one nearest you, go to Apple’s MUG page (http://www.apple.com/usergroups/).