Welcome Lisa,
The only way you are going to get more help is to ASK someone, That's how I got involved. But really I wanted to be involved in how my sons were going to enjoy their scouting adventure. You will have a better retainment of scouts in your pack if other parents get involved. The boys will see their parents helping out and will keep their intrest. I am not forcing my boys to stay in scouting but because they see me as a former Tiger Coach, Wolf & Bear Leader, Webelos Leader, Cubmaster, Asst. Scoutmaster and now Scoutmaster they see how much I love scouting and are learning commitment.
If you need help with ideas for pack meetings, go to your district roundtable and program preview to find out what the monthly themes are.
The reason no one wants to fill in is because you are taking care of it. You have to chose one postition or the other. Tell the parents they need to step up and they will get help from you not the other way around.
Good Luck.